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Many closings and cancellations followed the
September 11 attacks The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by al-Qaeda against the United States on Tuesday, September 11, 2001. That morning, nineteen terrorists hijacked four commer ...
, including major landmarks, buildings, restrictions on access to
Lower Manhattan Lower Manhattan (also known as Downtown Manhattan or Downtown New York) is the southernmost part of Manhattan, the central borough for business, culture, and government in New York City, which is the most populated city in the United States with ...
, as well as postponement or cancellation of major sporting and other events. Landmarks were closed primarily because of fears that they may be attacked. At some places, streets leading up to the institutions were also closed. When they reopened, there was heightened security. Many states declared a
state of emergency A state of emergency is a situation in which a government is empowered to be able to put through policies that it would normally not be permitted to do, for the safety and protection of its citizens. A government can declare such a state du ...
.


Lower Manhattan

Speaking at a press conference at 11:02 a.m. on the morning of the attacks, Mayor
Rudy Giuliani Rudolph William Louis Giuliani (, ; born May 28, 1944) is an American politician and lawyer who served as the 107th Mayor of New York City from 1994 to 2001. He previously served as the United States Associate Attorney General from 1981 to 19 ...
told New Yorkers: "If you are south of Canal Street, get out. Walk slowly and carefully. If you can't figure what else to do, just walk north." The neighborhood was covered in dust and debris, and electrical failures caused traffic light outages. Emergency vehicles were given priority to respond to ongoing fires, building collapses, and expected mass casualties. Over a million workers and residents south of Canal Street evacuated, and police stopped pedestrians from entering lower Manhattan. With subways shut down, vehicle traffic restricted, and tunnels closed, they mainly fled on foot, pouring over bridges and ferries to Brooklyn and New Jersey. On September 12, vehicle traffic was banned south of 14th Street, subway stations south of Canal Street were bypassed, and pedestrians were not permitted below Chambers Street. Vehicle traffic below Canal Street was not allowed until October 13. The
New York Stock Exchange The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange in the Financial District of Lower Manhattan in New York City. It is by far the world's largest stock exchange by market capitalization of its liste ...
did not open on September 11 even as
CNBC CNBC (formerly Consumer News and Business Channel) is an American basic cable business news channel. It provides business news programming on weekdays from 5:00 a.m. to 7:00 p.m., Eastern Time, while broadcasting talk s ...
showed futures numbers early in the day. As
Wall Street Wall Street is an eight-block-long street in the Financial District of Lower Manhattan in New York City. It runs between Broadway in the west to South Street and the East River in the east. The term "Wall Street" has become a metonym for ...
was covered in debris from the World Trade Center and suffered infrastructure damage, it remained closed until September 17.


Bridges and tunnels

For at least a full day after the attacks, bridges and tunnels to Manhattan were closed to non-emergency traffic in both directions. Among other things, this interrupted scheduled deliveries of food and other perishables, leading to shortages in restaurants. From September 27, 2001, one-occupant cars were banned from crossing into Lower Manhattan from Midtown on weekday mornings in an effort to relieve some of the crush of traffic in the city (the morning rush hour lasts from 5:30 a.m. to noon), caused largely by the increased security measures and closure of major vehicle and transit crossings.


Mass transit


New York City Subway

The tracks and stations under the WTC were shut down within minutes of the first plane crash. All remaining
New York City Subway The New York City Subway is a rapid transit system owned by the government of New York City and leased to the New York City Transit Authority, an affiliate agency of the state-run Metropolitan Transportation Authority (MTA). Opened on October ...
service was suspended from 10:20 a.m. to 12:48 p.m. Immediately after the attacks and more so after the collapses of the Twin Towers, many trains running in Lower Manhattan lost power and had to be evacuated through the tunnels. Some trains had power but the signals did not, requiring special operating procedures to ensure safety. The
IRT Broadway–Seventh Avenue Line The IRT Broadway–Seventh Avenue Line (also known as the IRT Seventh Avenue Line or the IRT West Side Line) is a New York City Subway line. It is one of several lines that serves the A Division, stretching from South Ferry in Lower Manhatta ...
, which ran below the World Trade Center between Chambers Street and Rector Street, was the most crippled. This section of the tunnel, including Cortlandt Street station (located directly underneath the World Trade Center), was badly damaged, and had to be rebuilt. Service was immediately suspended south of Chambers Street and then cut back to 14th Street. There was also subsequent flooding on the line south of 34th Street–Penn Station. After the flood was cleaned up, express service was able to resume on September 17 with trains running between Van Cortlandt Park–242nd Street and 14th Street, making local stops north of and express stops south of 96th Street, while and trains made all stops in Manhattan (but bypassed all stations between Canal Street and Fulton Street until October 1). 1/9 skip-stop service was suspended. After a few switching delays at 96th Street, service was changed on September 19. The train resumed local service in Manhattan, but was extended to New Lots Avenue in Brooklyn (switching onto the express tracks at Chambers Street) to replace the 3, which now terminated at 14th Street as an express. The train continued to make local stops in Manhattan and service between Chambers Street and South Ferry as well as skip-stop service remained suspended. Normal service on all four trains was restored September 15, 2002, but Cortlandt Street remained closed until September 8, 2018. Service on the
BMT Broadway Line The BMT Broadway Line is a rapid transit line of the B Division of the New York City Subway in Manhattan. , it is served by four services, all colored : the on the express tracks and the on the local tracks during weekdays (the N and Q train ...
was also disrupted because the tracks from the
Montague Street Tunnel The Montague Street Tunnel is a rail tunnel of the New York City Subway under the East River between the boroughs of Manhattan and Brooklyn, connecting the BMT Broadway Line and BMT Fourth Avenue Line. The R uses the tunnel at all times, the N ...
run adjacent to the World Trade Center and there were concerns that train movements could cause unsafe settling of the debris pile. Cortlandt Street station, which sits under Church Street, sustained significant damage in the collapse of the towers. It was closed until September 15, 2002 for removal of debris, structural repairs, and restoration of the track beds, which had suffered flood damage in the aftermath of the collapse. Starting September 17, 2001, and service was suspended and respectively replaced by the (which was extended to
Coney Island–Stillwell Avenue Coney may refer to: Places * Côney, a river in eastern France * Coney, Georgia, an unincorporated community in the United States * Coney Island (disambiguation) People * Dean Coney (born 1963), English footballer * Hykiem Coney (1982–2006 ...
via the BMT Montague Street Tunnel,
BMT Fourth Avenue Line The BMT Fourth Avenue Line is a rapid transit line of the New York City Subway, mainly running under Fourth Avenue in Brooklyn. The line is served by the D, N, and R at all times; the R typically runs local, while the D and N run express duri ...
, and
BMT Sea Beach Line The BMT Sea Beach Line is a rapid transit line of the BMT division of the New York City Subway, connecting the BMT Fourth Avenue Line at 59th Street via a four-track wide open cut to Coney Island in Brooklyn. It has at times hosted the fastest ...
) and the (also extended via Fourth Avenue to Bay Ridge–95th Street). In Queens, the replaced the while the replaced the . All service on the BMT Broadway Line ran local north of Canal Street except for the <Q>, which ran normally from 57th Street to
Brighton Beach Brighton Beach is a neighborhood in the southern portion of the New York City borough of Brooklyn, within the greater Coney Island area along the Atlantic Ocean coastline. Brighton Beach is bounded by Coney Island proper at Ocean Parkway to the ...
via Broadway and Brighton Express. J/Z skip-stop service was suspended at this time. Normal service on all seven trains resumed on October 28. The only subway line running between Midtown and Lower Manhattan was the
IRT Lexington Avenue Line The IRT Lexington Avenue Line (also known as the IRT East Side Line and the IRT Lexington–Fourth Avenue Line) is one of the lines of the A Division of the New York City Subway, stretching from Lower Manhattan north to 125th Street in Eas ...
, which was overcrowded before the attacks and at crush density until the BMT Broadway Line reopened.
Wall Street Wall Street is an eight-block-long street in the Financial District of Lower Manhattan in New York City. It runs between Broadway in the west to South Street and the East River in the east. The term "Wall Street" has become a metonym for ...
was closed until September 21. The
IND Eighth Avenue Line The IND Eighth Avenue Line is a rapid transit line in New York City, United States, and is part of the B Division of the New York City Subway. Opened in 1932, it was the first line of the Independent Subway System (IND), and the ''Eighth Avenu ...
, which has a stub terminal serving the train under Five World Trade Center, was undamaged, but covered in soot. E trains were extended to Euclid Avenue, Brooklyn, replacing the then suspended train (the and trains replaced it as the local north of 59th Street–Columbus Circle on nights and weekends, respectively. The train, which ran normally from 145th Street or Bedford Park Boulevard to 34th Street–Herald Square via Central Park West Local, also replaced C trains on weekdays). Service was cut back to Canal Street when C service resumed on September 21, but Chambers Street and Broadway–Nassau Street remained closed until October 1. World Trade Center remained closed until January 2002. There were no reported casualties on the subway or loss of train cars, but an MCI coach bus was destroyed. Another bus was damaged, but repaired and is back in normal service with a special commemoration livery.


PATH

PATH started evacuating passengers from its Manhattan trains and tracks within minutes of the first plane crash. The PATH station at World Trade Center was heavily damaged (a train parked in the station was crushed by debris and was removed during the excavation process in January 2002) and all service there was suspended. For several hours, PATH did not run any trains to Manhattan, but was able to restore service on the Uptown Hudson Tubes to 33rd Street by the afternoon. Exchange Place was unusable since the switch configuration at the time required all trains to continue to World Trade Center. As a result, PATH ran a modified service: Hoboken-Journal Square, Hoboken-33rd Street, and Newark-33rd Street. Exchange Place reopened with modifications on June 29, 2003; a temporary station replacing World Trade Center opened on November 23.


Ferries

Liberty Water Taxi Liberty Water Taxi is a water taxi service based at Liberty Landing Marina in Jersey City, New Jersey, United States offering service between Liberty State Park in Jersey City, Liberty Harbor in Jersey City and the Brookfield Place in Battery P ...
and
NY Waterway NY Waterway (or New York Waterway) is a private transportation company running ferry and bus service in the Port of New York and New Jersey and in the Hudson Valley. The company utilizes public-private partnership with agencies such as the Port ...
had a ferry terminal at the World Financial Center. As the area around the terminal was in the restricted zone, NY Waterway suspended service to the terminal with alternate service going to Midtown and
Wall Street Wall Street is an eight-block-long street in the Financial District of Lower Manhattan in New York City. It runs between Broadway in the west to South Street and the East River in the east. The term "Wall Street" has become a metonym for ...
and Liberty Water Taxi service was suspended. Free ad-hoc ferry service to New Jersey, Brooklyn, and Queens began by evening, with about half a million evacuees transported by Circle Line Tours, NY Waterway, privately owned dining boats, tug boats, and at least one fire boat.


Buses

MTA buses were temporarily suspended south of Canal Street, and MTA and NJ Transit buses were re-routed to serve passengers arriving in Brooklyn and New Jersey by walking and taking ferries out of Manhattan.


Intercity transit

The
Port Authority Bus Terminal The Port Authority Bus Terminal (colloquially known as the Port Authority and by its acronym PABT) is a bus terminal located in Manhattan in New York City. It is the busiest bus terminal in the world by volume of traffic, serving about 8,000 bus ...
was closed until September 13.
Amtrak The National Railroad Passenger Corporation, doing business as Amtrak () , is the national passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous U.S. States and nine cities in Canada. ...
suspended all of its rail service nationwide until 6pm. Greyhound Bus Lines cancelled its bus service in the Northeast, but was running normally by September 13.


North American airspace

The entire airspaces of the United States and Canada were closed ("
ground stop A ground stop is an air traffic control measure that slows or halts the flow of aircraft inbound to a given airport. In other words, a ground stop is the halting of departing aircraft destined for one particular airport or for a specific geograp ...
") by order of FAA National Operations Manager Ben Sliney (who was working his first day in that position) except for military, police, and medical flights. The unprecedented implementation of
Security Control of Air Traffic and Air Navigation Aids The Plan for the Security Control of Air Traffic and Air Navigation Aids (SCATANA) is an emergency preparedness plan of the United States which prescribes the joint action to be taken by appropriate elements of the Department of Defense, Federa ...
(SCATANA) was the first unplanned closure in the U.S.; military exercises known as
Operation Skyshield Operation Sky Shield, sometimes known as Exercise Skyshield, was a series of three large-scale military exercises conducted in the United States in 1960, 1961, and 1962 by the North American Aerospace Defense Command (NORAD) and the Strategic Air ...
had temporarily closed the airspace in the early 1960s. Domestic planes were diverted to the nearest available airport. All non-military flights needed specific approval from the
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Si ...
and the FAA. There were only a few dozen private aircraft which received approvals in that time period.
Civil Air Patrol Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
's aerial photography unit was the earliest non-military flight granted approval.
United Airlines United Airlines, Inc. (commonly referred to as United), is a major American airline headquartered at the Willis Tower in Chicago, Illinois.
cancelled all flights worldwide temporarily. Grounded passengers and planes were searched for security threats.
Amtrak The National Railroad Passenger Corporation, doing business as Amtrak () , is the national passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous U.S. States and nine cities in Canada. ...
was closed until 6pm on September 11, but by September 13 it had increased capacity 30% to deal with an influx of stranded plane passengers. President George W. Bush was transported to a secure location via
Air Force One Air Force One is the official air traffic control designated call sign for a United States Air Force aircraft carrying the president of the United States. In common parlance, the term is used to denote U.S. Air Force aircraft modified and us ...
. Many incoming international flights were diverted to
Atlantic Canada Atlantic Canada, also called the Atlantic provinces (french: provinces de l'Atlantique), is the region of Eastern Canada comprising the provinces located on the Atlantic coast, excluding Quebec. The four provinces are New Brunswick, Newfoundla ...
to avoid proximity to potential targets in the US and large cities in Canada. Some international flights that departed from South America were diverted to
Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...
, however its airspace was not shut down. On Thursday night, the New York area airports ( JFK,
LaGuardia LaGuardia Airport is a civil airport in East Elmhurst, Queens, New York City. Covering , the facility was established in 1929 and began operating as a public airport in 1939. It is named after former New York City mayor Fiorello La Guardi ...
, and Newark) were closed again and reopened the next morning. The only traffic from LaGuardia during the closure was a single C-9C government VIP jet, departing at approximately 5:15 p.m. on the 12th. Civilian air traffic was allowed to resume on September 13, 2001, with stricter airport security checks, disallowing for example the box cutting knives that were used by the hijackers. (Reinforcement of cockpit doors began in October 2001, and was required for larger airlines by 2003.) First, stranded planes were allowed to fly to their intended destinations, then limited service resumed. The backlog of delayed passengers took several days to clear. Due to a translation error, controllers believed
Korean Air Flight 85 On September 11, 2001, Korean Air Flight 085 (originating from Incheon International Airport in Seoul, South Korea) was en-route to Ted Stevens International Airport in Anchorage, Alaska, when information about the September 11 attacks was relay ...
might have been hijacked.
Canadian Prime Minister The prime minister of Canada (french: premier ministre du Canada, link=no) is the head of government of Canada. Under the Westminster system, the prime minister governs with the confidence of a majority the elected House of Commons; as such ...
Jean Chrétien Joseph Jacques Jean Chrétien (; born January 11, 1934) is a Canadian lawyer and politician who served as the 20th prime minister of Canada from 1993 to 2003. Born and raised in Shawinigan, Shawinigan Falls, Quebec, Chrétien is a law gradua ...
and U.S. authorities ordered the United States Air Force to surround the plane and force it to land in
Whitehorse, Yukon Whitehorse () is the capital of Yukon, and the largest city in Northern Canada. It was incorporated in 1950 and is located at kilometre 1426 (Historic Mile 918) on the Alaska Highway in southern Yukon. Whitehorse's downtown and Riverdale areas ...
and to shoot down the plane if the pilots did not cooperate. Alaska Governor Tony Knowles ordered the evacuation of large hotels and government buildings in Anchorage. Also in Alaska at nearby Valdez, the U.S. Coast Guard ordered all tankers filling up with oil to head out to sea. Canadian officials evacuated all schools and large buildings in Whitehorse before the plane landed safely.


Precautionary building closings and evacuations

Many businesses across the United States closed after the intentional nature of the events became clear, and many national landmarks and financial district skyscrapers were evacuated out of fear of further attacks.


United States

* United Nations Headquarters Building in New York City * Most skyscrapers in New York City (including the
Chrysler Building The Chrysler Building is an Art Deco skyscraper on the East Side of Manhattan in New York City, at the intersection of 42nd Street and Lexington Avenue in Midtown Manhattan. At , it is the tallest brick building in the world with a steel fra ...
and
Empire State Building The Empire State Building is a 102-story Art Deco skyscraper in Midtown Manhattan, New York City. The building was designed by Shreve, Lamb & Harmon and built from 1930 to 1931. Its name is derived from " Empire State", the nickname of the ...
, which was evacuated several times on September 11 and after due to false reports of potential threats), Chicago (including
Sears Tower The Willis Tower (originally the Sears Tower) is a 108- story, skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM ...
) and Philadelphia * The
Washington Monument The Washington Monument is an obelisk shaped building within the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army (1775–1784) in the American Revolutionary War and ...
in Washington, D.C. * The
Statue of Liberty The Statue of Liberty (''Liberty Enlightening the World''; French: ''La Liberté éclairant le monde'') is a colossal neoclassical sculpture on Liberty Island in New York Harbor in New York City, in the United States. The copper statue, ...
,
Ellis Island Ellis Island is a federally owned island in New York Harbor, situated within the U.S. states of New York and New Jersey, that was the busiest immigrant inspection and processing station in the United States. From 1892 to 1954, nearly 12 mil ...
and ferries to both in and out of New York City * All state capitols and many government buildings surrounding the capitols * Many landmarks in the United States, including the
Mall of America Mall of America (MOA) is a large shopping mall located in Bloomington, Minnesota, United States. Located within the Minneapolis–Saint Paul metropolitan area, the mall lies southeast of the junction of Interstate 494 and Minnesota State Highway ...
outside of
Minneapolis Minneapolis () is the largest city in Minnesota, United States, and the county seat of Hennepin County. The city is abundant in water, with thirteen lakes, wetlands, the Mississippi River, creeks and waterfalls. Minneapolis has its origin ...
,
Minnesota Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the 22nd most populous, with over 5.75 million residents. Minnesota is home to western prairies, now given over t ...
and the
Space Needle The Space Needle is an observation tower in Seattle, Washington, United States. Considered to be an icon of the city, it has been designated a Seattle landmark. Located in the Lower Queen Anne neighborhood, it was built in the Seattle Cente ...
and
Columbia Center The Columbia Center, formerly named the Bank of America Tower and Columbia Seafirst Center, is a skyscraper in downtown Seattle, Washington, United States. The 76-story structure is the tallest building in Seattle and the state of Washington, r ...
in
Seattle Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest region o ...
,
Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...
* All federal buildings in Washington, D.C., including the
White House The White House is the official residence and workplace of the president of the United States. It is located at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every U.S. president since John Adams in ...
, the
United States Capitol The United States Capitol, often called The Capitol or the Capitol Building, is the seat of the legislative branch of the United States federal government, which is formally known as the United States Congress. It is located on Capitol Hill ...
, the
United States Supreme Court Building The Supreme Court Building houses the Supreme Court of the United States. Also referred to as "The Marble Palace," the building serves as the official workplace of the chief justice of the United States and the eight associate justices of th ...
and
Blair House Blair House, also known as The President's Guest House, is an official residence in Washington, D.C., the capital of the United States. The President's Guest House has been called "the world's most exclusive hotel" because it is primarily used ...
. Across the country, approximately one million federal workers were sent home *The D.C. Department of Motor Vehicles (although all other D.C. government offices remained open) *The United States Patent and Trademark Office *
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeedin ...
, including all field centers and the agency's headquarters in Washington, D.C. *Resorts and vacation spots including: **
Disneyland Disneyland is a theme park in Anaheim, California. Opened in 1955, it was the first theme park opened by The Walt Disney Company and the only one designed and constructed under the direct supervision of Walt Disney. Disney initially envisio ...
and
Knotts Berry Farm Knott's Berry Farm is a theme park located in Buena Park, California, owned and operated by Cedar Fair. In 2015, it was the twelfth-most-visited theme park in North America and averages approximately 4 million visitors per year. It features 40 ...
(only on September 11) **
Walt Disney World The Walt Disney World Resort, also called Walt Disney World or Disney World, is an entertainment resort complex in Bay Lake and Lake Buena Vista, Florida, United States, near the cities of Orlando and Kissimmee. Opened on October 1, 1971, ...
(only on September 11) **
Universal Studios Florida Universal Studios Florida (also known as Universal Studios or USF) is a theme park located in Orlando, Florida. Primarily themed to movies, television and other aspects of the entertainment industry, the park opened to the public on June 7, 1990 ...
**
Universal Studios Hollywood Universal Studios Hollywood is a film studio and theme park in the San Fernando Valley area of Los Angeles County, California. About 70% of the studio lies within the unincorporated county island known as Universal City while the rest lies w ...
**
SeaWorld SeaWorld is an American theme park chain with headquarters in Orlando, Florida. It is a proprietor of marine mammal parks, oceanariums, animal theme parks, and rehabilitation centers owned by SeaWorld Parks & Entertainment (one park will be ...
**
Six Flags Six Flags Entertainment Corporation is an American amusement park corporation, headquartered in Arlington, Texas. It has properties in Canada, Mexico, and the United States. Six Flags owns the most theme parks and waterparks combined of any a ...
*All television and movie studios in
Hollywood Hollywood usually refers to: * Hollywood, Los Angeles, a neighborhood in California * Hollywood, a metonym for the cinema of the United States Hollywood may also refer to: Places United States * Hollywood District (disambiguation) * Hollywoo ...
,
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world ...
,
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
*All Westfield shopping centers, malls and shoppingtowns nationwide, as they owned the underground shopping mall at the World Trade Center * The
John Hancock Tower 200 Clarendon Street, previously John Hancock Tower and colloquially known as The Hancock, is a 60-story, skyscraper in the Back Bay neighborhood of Boston. It is the tallest building in New England. The tower was designed by Henry N. Cobb of ...
and
Prudential Tower The Prudential Tower, also known as the Prudential Building or, colloquially, The Pru,subscription required'The Pru' everyone calls it: a resigned shrug of a name, as flat and uninflected as the wan moue its pronunciation requires." is an Inter ...
in
Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...
* Enron Complex and several other skyscrapers in
Downtown Houston Downtown is the largest central business district in the city of Houston and the largest in the state of Texas, located near the geographic center of the metropolitan area at the confluence of Interstate 10, Interstate 45, and Interstate 69. The ...
* The
Transamerica Pyramid The Transamerica Pyramid is a 48-story futurist skyscraper in San Francisco, California, United States, and the second tallest building in the San Francisco skyline. Located at 600 Montgomery Street between Clay and Washington Streets in the c ...
in
San Francisco San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17t ...
* The U.S. Steel Tower in
Pittsburgh Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...
* The Renaissance Center in
Detroit Detroit ( , ; , ) is the largest city in the U.S. state of Michigan. It is also the largest U.S. city on the United States–Canada border, and the seat of government of Wayne County. The City of Detroit had a population of 639,111 at t ...
* The IDS Tower in
Minneapolis Minneapolis () is the largest city in Minnesota, United States, and the county seat of Hennepin County. The city is abundant in water, with thirteen lakes, wetlands, the Mississippi River, creeks and waterfalls. Minneapolis has its origin ...
*
Bank of America The Bank of America Corporation (often abbreviated BofA or BoA) is an American multinational investment bank and financial services holding company headquartered at the Bank of America Corporate Center in Charlotte, North Carolina. The bank ...
and
Wachovia Wachovia was a diversified financial services company based in Charlotte, North Carolina. Before its acquisition by Wells Fargo and Company in 2008, Wachovia was the fourth-largest bank holding company in the United States, based on total asset ...
headquarters towers in
Uptown Charlotte Uptown Charlotte, also called Center City, is the central business district of Charlotte, North Carolina. The area is split into four wards by the intersection of Trade and Tryon Streets, and bordered by Interstate 277 and Interstate 77. The ar ...
* The World Trade Center in
Saint Paul, Minnesota Saint Paul (abbreviated St. Paul) is the capital of the U.S. state of Minnesota and the county seat of Ramsey County. Situated on high bluffs overlooking a bend in the Mississippi River, Saint Paul is a regional business hub and the center ...
*
OneAmerica Tower The OneAmerica Tower, formerly AUL Tower, is a 38-story building at 200 North Illinois Street in Downtown Indianapolis, downtown Indianapolis, Indiana. It is used by various companies for offices. The building opened in 1982 and is faced with Ind ...
in
Indianapolis Indianapolis (), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion ...
*
HSBC HSBC Holdings plc is a British multinational universal bank and financial services holding company. It is the largest bank in Europe by total assets ahead of BNP Paribas, with US$2.953 trillion as of December 2021. In 2021, HSBC had $10.8 tr ...
Tower in
Buffalo, New York Buffalo is the second-largest city in the U.S. state of New York (behind only New York City) and the seat of Erie County. It is at the eastern end of Lake Erie, at the head of the Niagara River, and is across the Canadian border from Sou ...
*
AXA Axa S.A. (styled as ''AXA'' or GIG in the Middle East) is a French multinational insurance company. The head office is in the 8th arrondissement of Paris, France. It also provides investment management and other financial services. The ...
Towers in
Syracuse, New York Syracuse ( ) is a city in and the county seat of Onondaga County, New York, United States. It is the fifth-most populous city in the state of New York following New York City, Buffalo, Yonkers, and Rochester. At the 2020 census, the city' ...
* Sunset Bronson Studios in Hollywood *
AOL AOL (stylized as Aol., formerly a company known as AOL Inc. and originally known as America Online) is an American web portal and online service provider based in New York City. It is a brand marketed by the current incarnation of Yahoo! Inc. ...
Headquarters in
Dulles, Virginia Dulles () is an unincorporated area in Loudoun County, Virginia, United States, and is part of the Washington metropolitan area. The headquarters of Northrop Grumman Innovation Systems and ODIN Technologies, as well as the former headquarters of ...


International

*
Toronto Toronto ( ; or ) is the capital city of the Canadian province of Ontario. With a recorded population of 2,794,356 in 2021, it is the most populous city in Canada and the fourth most populous city in North America. The city is the anch ...
:
CN Tower The CN Tower (french: Tour CN) is a concrete communications and observation tower in downtown Toronto, Ontario, Canada. Built on the former Railway Lands, it was completed in 1976. Its name "CN" referred to Canadian National, the railway c ...
, Toronto-Dominion Centre,
Toronto Stock Exchange The Toronto Stock Exchange (TSX; french: Bourse de Toronto) is a stock exchange located in Toronto, Ontario, Canada. It is the 10th largest exchange in the world and the third largest in North America based on market capitalization. Based in the ...
, *
Ottawa Ottawa (, ; Canadian French: ) is the capital city of Canada. It is located at the confluence of the Ottawa River and the Rideau River in the southern portion of the province of Ontario. Ottawa borders Gatineau, Quebec, and forms the c ...
:
Parliament Hill Parliament Hill (french: Colline du Parlement, colloquially known as The Hill, is an area of Crown land on the southern banks of the Ottawa River in downtown Ottawa, Ontario, Canada. Its Gothic revival suite of buildings, and their archit ...
,
Supreme Court of Canada The Supreme Court of Canada (SCC; french: Cour suprême du Canada, CSC) is the Supreme court, highest court in the Court system of Canada, judicial system of Canada. It comprises List of Justices of the Supreme Court of Canada, nine justices, wh ...
, *
London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
:
Canary Wharf Canary Wharf is an area of London, England, located near the Isle of Dogs in the London Borough of Tower Hamlets. Canary Wharf is defined by the Greater London Authority as being part of London's central business district, alongside Central Lon ...
,
Lloyd's building The Lloyd's building (sometimes known as the Inside-Out Building) is the home of the insurance institution Lloyd's of London. It is located on the former site of East India House in Lime Street, in London's main financial district, the City o ...
,
Stock Exchange Tower 125 Old Broad Street, formerly known as the Stock Exchange Tower and still often referred to as such, is a high-rise office building in London, located on Old Broad Street in the City of London financial district. For over 30 years the Stock Exc ...
,
NatWest Tower Tower 42, commonly known as the NatWest Tower, is a skyscraper in the City of London. It is the fifth-tallest tower in the City of London, having been overtaken as the tallest in 2010 by the Heron Tower. It is the fifteenth- tallest in Lond ...
*
Kuala Lumpur , anthem = ''Maju dan Sejahtera'' , image_map = , map_caption = , pushpin_map = Malaysia#Southeast Asia#Asia , pushpin_map_caption = , coordinates = , sub ...
:
Petronas Towers The Petronas Towers, also known as the Petronas Twin Towers or KLCC Twin Towers, ( Malay: ''Menara Berkembar Petronas'') are 88-storey supertall skyscrapers in Kuala Lumpur, Malaysia, standing at . From 1998 to 2003, they were officially desig ...


Government and cultural cancellations and postponements

In an atmosphere reminiscent of the
assassination of John F. Kennedy John F. Kennedy, the 35th president of the United States, was assassinated on Friday, November 22, 1963, at 12:30 p.m. CST in Dallas, Texas, while riding in a presidential motorcade through Dealey Plaza. Kennedy was in the vehicle with ...
in 1963, everyday life around the world came to a standstill in the days after the September 11 attacks. For this reason, as well as for reasons of perceived threat associated with large gatherings, many events were postponed or cancelled. Other events were also cancelled, postponed, or modified: *Voting on September 11 in the City of New York Mayoral Primary Election was halted. Elections in
Syracuse Syracuse may refer to: Places Italy * Syracuse, Sicily, or spelled as ''Siracusa'' * Province of Syracuse United States *Syracuse, New York **East Syracuse, New York ** North Syracuse, New York * Syracuse, Indiana *Syracuse, Kansas *Syracuse, M ...
and
Buffalo, New York Buffalo is the second-largest city in the U.S. state of New York (behind only New York City) and the seat of Erie County. It is at the eastern end of Lake Erie, at the head of the Niagara River, and is across the Canadian border from Sou ...
were also delayed. *The
Commonwealth Heads of Government Meeting The Commonwealth Heads of Government Meeting (CHOGM; or) is a biennial summit meeting of the governmental leaders from all Commonwealth nations. Despite the name, the head of state may be present in the meeting instead of the head of ...
(CHOGM), with the
Heads of Government The head of government is the highest or the second-highest official in the executive branch of a sovereign state, a federated state, or a self-governing colony, autonomous region, or other government who often presides over a cabinet, a ...
of the
Commonwealth of Nations The Commonwealth of Nations, simply referred to as the Commonwealth, is a political association of 56 member states, the vast majority of which are former territories of the British Empire. The chief institutions of the organisation are the C ...
to be held in
Brisbane Brisbane ( ) is the capital and most populous city of the Australian state of Queensland, and the third-most populous city in Australia and Oceania, with a population of approximately 2.6 million. Brisbane lies at the centre of the South ...
, the state capital of
Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...
,
Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...
, was postponed. The organizers of the meeting claimed it was not so much a fear of terrorist attack on the meeting itself, but a desire by many Commonwealth leaders to stay at home in case of any further crisis-making world events (such as the commencement of overt military action in Afghanistan or elsewhere). The CHOGM was eventually convened at
Coolum Beach, Queensland Coolum Beach is a beachside town and coastal suburb in the Sunshine Coast Region, Queensland, Australia. In the , the suburb of Coolum Beach had a population of 8,497 people. Geography Coolum Beach has the following mountains (from north to s ...
. *The Mexican Independence Parade scheduled for September 16 in
Mexico City Mexico City ( es, link=no, Ciudad de México, ; abbr.: CDMX; Nahuatl: ''Altepetl Mexico'') is the capital and largest city of Mexico, and the most populous city in North America. One of the world's alpha cities, it is located in the Valley o ...
was delayed one day in a show of compassion; many other Independence celebrations were held on the 16th without fireworks. *Clothing retailer
Abercrombie & Fitch Abercrombie & Fitch (A&F) is an American lifestyle retailer that focuses on casual wear. Its headquarters are in New Albany, Ohio. The company operates three other offshoot brands: Abercrombie Kids, Hollister Co., and Gilly Hicks. As of Februa ...
canceled its Christmas 2001 issue of '' A&F Quarterly'' because the company felt the tone of the publication was not suitable for the mood at that time.Stuart Elliott
Bowing to Nation's Mood, Retailer Cancels Issue of Racy Catalog
, ''New York Times'', October 17, 2001.


References

{{DEFAULTSORT:Closings And Cancellations Following The September 11 Attacks Aftermath of the September 11 attacks History of the New York City Subway