A bomb threat or bomb scare is a threat, usually
verbal or
written, to detonate an
explosive
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An ex ...
or
incendiary device
Incendiary weapons, incendiary devices, incendiary munitions, or incendiary bombs are weapons designed to start fires. They may destroy structures or sensitive equipment using fire, and sometimes operate as anti-personnel weapon, anti-personnel ...
to cause
property damage
Property damage (sometimes called damage to property) is the damage or destruction of real or tangible personal property, caused by negligence, willful destruction, or an act of nature. Destruction of property (sometimes called property de ...
,
death
Death is the end of life; the irreversible cessation of all biological functions that sustain a living organism. Death eventually and inevitably occurs in all organisms. The remains of a former organism normally begin to decompose sh ...
,
injuries
Injury is physiological damage to the living tissue of any organism, whether in humans, in other animals, or in plants.
Injuries can be caused in many ways, including mechanically with penetration by sharp objects such as teeth or with b ...
, and/or incite
fear
Fear is an unpleasant emotion that arises in response to perception, perceived dangers or threats. Fear causes physiological and psychological changes. It may produce behavioral reactions such as mounting an aggressive response or fleeing the ...
,
whether or not such a device actually exists.
History
Bomb threats were used to incite fear and violence during the
American Civil Rights Movement, during which leader of the movement
Martin Luther King Jr.
Martin Luther King Jr. (born Michael King Jr.; January 15, 1929 – April 4, 1968) was an American Baptist minister, civil and political rights, civil rights activist and political philosopher who was a leader of the civil rights move ...
received multiple bomb threats during public addresses,
and schools forced to integrate faced strong opposition, resulting in 43 bomb threats against Central High School in Arkansas being broadcast on TV and the radio.
Motivations
Supposed motives for bomb threats include: "humor, self assertion, anger, manipulation, aggression, hate and devaluation, omnipotence, fantasy, and psychotic distortion, ideology, retaliation," and creating chaos.
Many of the motives based on personal emotion are speculative.
Bomb threats that aren’t intended to be pranks are often made as parts of other crimes, such as
extortion
Extortion is the practice of obtaining benefit (e.g., money or goods) through coercion. In most jurisdictions it is likely to constitute a criminal offence. Robbery is the simplest and most common form of extortion, although making unfounded ...
,
arson
Arson is the act of willfully and deliberately setting fire to or charring property. Although the act of arson typically involves buildings, the term can also refer to the intentional burning of other things, such as motor vehicles, watercr ...
, or
aircraft hijacking
Aircraft hijacking (also known as airplane hijacking, skyjacking, plane hijacking, plane jacking, air robbery, air piracy, or aircraft piracy, with the last term used within the special aircraft jurisdiction of the United States) is the Crime, ...
. Actual bombings for
malicious destruction of property,
terrorism
Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war aga ...
, or
murder
Murder is the unlawful killing of another human without justification (jurisprudence), justification or valid excuse (legal), excuse committed with the necessary Intention (criminal law), intention as defined by the law in a specific jurisd ...
are often perpetrated without warning.
Ideological
Bomb threats may be motivated by political, religious, and ideological differences. These include political issues,
abortion
Abortion is the early termination of a pregnancy by removal or expulsion of an embryo or fetus. Abortions that occur without intervention are known as miscarriages or "spontaneous abortions", and occur in roughly 30–40% of all pregnan ...
, animal testing,
eco-terrorism
Eco-terrorism is an act of violence which is committed in support of environmental causes, against people or property.
The United States Federal Bureau of Investigation (FBI) defines eco-terrorism as "...the use or threatened use of violence of ...
, and use of
nuclear power
Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by ...
. The aim of these threats is to draw attention to certain causes or incite fear and unrest among those who support said causes.
Some threats are racially-motivated, while others are made against houses of worship or research and medical facilities.
Extortion
Bomb threats made as part of
extortion
Extortion is the practice of obtaining benefit (e.g., money or goods) through coercion. In most jurisdictions it is likely to constitute a criminal offence. Robbery is the simplest and most common form of extortion, although making unfounded ...
schemes demand some form of bribe, payment, or incentive to prevent the use of a bomb. The payment can be made in the form of cash,
Bitcoin
Bitcoin (abbreviation: BTC; Currency symbol, sign: ₿) is the first Decentralized application, decentralized cryptocurrency. Based on a free-market ideology, bitcoin was invented in 2008 when an unknown entity published a white paper under ...
, or forcing the victim to adhere to demands.
Hoax device
A hoax device has the appearance of a destructive device or biological weapon, and is intended to cause a reasonable person to assume the item was a truly destructive device capable of causing injury or death. Because of the potential for loss of life, injury, and property damage of a bomb detonation, bomb threats are treated as realistic and maliciously intended by authorities until proven otherwise.
Bomb threats made as jokes or pranks, especially those made against schools, annually waste thousands of dollars in law enforcement costs, other government resources, and educational time.
These threats may be made as distractions or disruptions, forcing school officials to cancel or postpone planned activities such as exams.
False flag
False flag
A false flag operation is an act committed with the intent of disguising the actual source of responsibility and pinning blame on another party. The term "false flag" originated in the 16th century as an expression meaning an intentional misrep ...
bomb threats are made to create the appearance of a specific group or person being responsible for an activity to disguise the true perpetrators.
Political
Bomb threats can be part of politically-motivated operations. For example: It was reportedly used as a pretext by the
Belarusian government to divert
Ryanair Flight 4978 to
Minsk
Minsk (, ; , ) is the capital and largest city of Belarus, located on the Svislach (Berezina), Svislach and the now subterranean Nyamiha, Niamiha rivers. As the capital, Minsk has a special administrative status in Belarus and is the administra ...
to arrest
Raman Pratasevich, an oppositional figure. As a result the nation was accused of committing
state terrorism
State terrorism is terrorism conducted by a state against its own citizens or another state's citizens.
It contrasts with '' state-sponsored terrorism'', in which a violent non-state actor conducts an act of terror under sponsorship of a state. ...
.
Targets
Schools and universities
Bomb threats are often made toward educational institutions. They are typically by students who are overwhelmed by academic pressure, are resentful of the school, and/or are acting on violent impulses. Their frustration may be aimed at specific groups or individuals that are part of the school’s community.
During 1999— which was the most recent year with publicly published data as of 2005— roughly 5% of bomb threats made in the United States targeted schools. Over a decade later bomb threats against schools saw a 33% increase of while threats against residences decreased by 35% between 2014 and 2016.
Perpetrators of bomb threats are usually immediately expelled or fired from the school.
On December 16, 2013 at approximately 8:30 a.m. the final exams at
Harvard University
Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...
were disrupted by several anonymous emails threatening plant
shrapnel bombs at various locations on the campus. The FBI charged Eldo Kim, a
sophomore
In the United States, a sophomore ( or ) is a person in the second year at an educational institution; usually at a secondary school or at the college and university level, but also in other forms of Post-secondary school, post-secondary educatio ...
at Harvard, for the false bomb threats on the following day.
Eldo Kim agreed to take responsibility for his attempt to cancel the fall 2013 final exams on November 19th, 2014. Following his legal agreement, Kim agreed to publish his confession in
The Harvard Crimson
''The Harvard Crimson'' is the student newspaper at Harvard University, an Ivy League university in Cambridge, Massachusetts, United States. The newspaper was founded in 1873, and is run entirely by Harvard College undergraduate students.
His ...
on November 25th, pay restitution to law enforcement agencies, complete a rehabilitative "diversionary program", remain under home confinement for four months, and perform 750 hours of community service.
Public figures
Bomb threats against political figures such as the
President of the United States
The president of the United States (POTUS) is the head of state and head of government of the United States. The president directs the Federal government of the United States#Executive branch, executive branch of the Federal government of t ...
, occur regularly and are illegal under the United States Code Title 18, Section 871 law.
The
British royal family
The British royal family comprises Charles III and other members of his family. There is no strict legal or formal definition of who is or is not a member, although the Royal Household has issued different lists outlining who is considere ...
, specifically Queen Elizabeth, has faced bomb threats based on blame for the actions of the British government. Celebrities may also be the victims of bomb threats, especially those who have expressed political views, or those who are leaders of political causes.
Author
Salman Rushdie
Sir Ahmed Salman Rushdie ( ; born 19 June 1947) is an Indian-born British and American novelist. His work often combines magic realism with historical fiction and primarily deals with connections, disruptions, and migrations between Eastern wor ...
and his publisher faced multiple bomb threats from Islamic fundamentalist groups because of his controversial book
The Satanic Verses, which was interpreted by these groups as opposing Muslim ideology.
Government and public infrastructure

Many buildings are the recipients of bomb threats, including transportation hubs such as airports and train stations,
power plants, medical facilities, and government buildings
such as
the Pentagon
The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As ...
,
the US Embassy, and the
Casa Rosada. Among these, airports, city halls, and courthouses are most likely to experience repeated bomb threats.
Among bomb threats related to transportation, threats and false information knowingly provided about bombs on airplanes have the most severe response.
Private institutions and businesses
Private institutions and businesses, including as banks, department stores, malls, casinos, restaurants, manufacturing plants,
and truck stops, have been the recipients of bomb threats for various reasons.
Some bomb threats are made because of ideological differences or opposition to the mission or perceived mission of the institution, such as those made against
Planned Parenthood
The Planned Parenthood Federation of America, Inc. (PPFA), or simply Planned Parenthood, is an American nonprofit organization and abortion clinics,
news organizations such as
CNN,
or nuclear facilities.
[Mazur, Allan. “Bomb Threats and the Mass Media: Evidence for a Theory of Suggestion.” ''American Sociological Review'', vol. 47, no. 3, 1982, pp. 407–411. ''JSTOR'', www.jstor.org/stable/2094997.] From 1983 to 1992, the World Trade Center experienced roughly 350 bomb threats and scares for various reasons.
Some threats are motivated by money, involving an offender demanding a payoff from a bank or department store over a public phone.
Other reasons for attacking a restaurant or shopping center include revenge or vandalism, the primary motives found in a study analyzing 69 Finnish offenders.
Methods
A majority of bomb threats are perpetrated by middle-aged men who make these threats via a telephone call.
Different types of offenders tend to call the target directly on a public phone to demand money, call directly on a personal line because of resentment, or call emergency service lines and make threats for personal entertainment.
Bomb threats may also be made by text message, as in the case of a March 2004 message to a private operator sending a warning of bombs in five
Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with ...
schools,
and February 2014 messages to school employees of
Ateneo de Manila University.
Bomb threats may be made in letters or notes,
delivered either personally or through the mail system. Packages intended to mimic or represent bombs, including backpacks, luggage, bags, or attache cases,
even if they may not have the capability of exploding because of poor construction or intentional choices, are still treated as potential explosives, as in the case of 13 devices mailed to various politicians and opponents of
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
.
Electronic bomb threats may be made over websites,
email,
or social media,
as in the case of the emailed wave of
2018 Bitcoin bomb threats in the United States and Canada.
A series of mail bombs sent to celebrities based on their political ideologies was found to have been preceded by threats on
Twitter
Twitter, officially known as X since 2023, is an American microblogging and social networking service. It is one of the world's largest social media platforms and one of the most-visited websites. Users can share short text messages, image ...
.
They can also be made face-to-face.
Indirect threats
Many activities treated as bomb threats do not explicitly state an intent to set off an explosive; nevertheless, they convey through context or action that a threat is being made. Some actions may indicate an intent to bomb, such as parking a truck outside an abortion clinic, after a similar bombing made by the same vehicle. In other scenarios, a message mentioning bombs may be interpreted as a threat based on context, such as an email to a school principal reading "bomb,"
a statement that a bomb exists in a specific location,
the expression of a desire to build a bomb, a description of a bomb that was placed,
or other communications.
Credibility and response
Most bomb threats are false alarms which do not involve actual explosives, only the incitement of fear.
There are more bomb threats than incidents, with only 14 of 1,055 school incidents recorded from 1990 to 2002 being preceded by threats.
According to the Hunter-Howler threat dynamic, the group of people who make bomb threats is largely separate from those who attempt a real bombing, which typically occurs without warning.
Standard procedure is usually to take all threats seriously because civilians are usually threatened by them if valid as well as the community, and arrests may be made even for bomb threats made falsely as in most jurisdictions even hoaxes are a crime.
Signs that a threat is legitimate include an out-of-place object found, a motive or specific targets being stated, and multiple calls or specific threats being made.
Police and
bomb disposal
Bomb disposal is an explosives engineering profession using the process by which hazardous explosive devices are disabled or otherwise rendered safe. ''Bomb disposal'' is an all-encompassing term to describe the separate, but interrelated fun ...
professionals are typically alerted to respond to bomb threat incidents to assess and mitigate potential harm. Schools and government organizations offer instructions and sometimes training for both bomb prevention planning and response to assist those facing bomb threats. Organizations involved in responding to a bomb threat may also include anti-terrorism government agencies, fire departments, and other emergency services.
The decision to
evacuate an area or
building
A building or edifice is an enclosed Structure#Load-bearing, structure with a roof, walls and window, windows, usually standing permanently in one place, such as a house or factory. Buildings come in a variety of sizes, shapes, and functions, a ...
, depending on the perceived reliability of the threat, may be made by local controlling authorities or those in charge of the targeted facility based on advice from
bomb disposal
Bomb disposal is an explosives engineering profession using the process by which hazardous explosive devices are disabled or otherwise rendered safe. ''Bomb disposal'' is an all-encompassing term to describe the separate, but interrelated fun ...
experts.
When a large facility is involved, it can be very difficult and time-consuming to ensure the absence of any bomb or other hazardous device or substance. A search is conducted for out-of-place packages that have features such as unusual shapes, sounds, smells, leakage, or electrical components. Bomb-sniffing dogs may be used as part of this search.
Forensic evidence and law enforcement searches are then used to attempt to locate the perpetrator.
Law
While the terms "bomb threat" and "bomb scare" are often used interchangeably, a bomb threat in the legal context is typically in the form of a statement, or some "communicated intent to inflict harm,"
whereas a "bomb scare" refers to situations of imminent risk, such as the discovery of a suspicious bag.
These are both distinct from false statements knowingly made about bombs, which are sometimes also criminalized.
Some statutory definitions include the threatened use, release or placement of other harmful agents, such as
poison
A poison is any chemical substance that is harmful or lethal to living organisms. The term is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figurati ...
s,
biological pathogens,
radioactive
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is conside ...
materials, or even a dangerous weapon (e.g., aboard an airliner). Other statutes enhance the penalties for threats made against specific places or persons (e.g. government facilities or dignitaries), and the actual
possession of harmful devices or agents. Prosecution of making a bomb threat hinges only on the victim's reasonable belief of the threat's veracity rather than the actual existence of a dangerous device.
United States
A total of 1536 bomb threat incidents took place in the US in 2016, 254 of which were made against businesses and 186 of which were made to residences.
Criminal statutes typically dictate severe penalties. For example, in
the United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
,
Massachusetts
Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...
provides for penalties of up to 20 years in
prison
A prison, also known as a jail, gaol, penitentiary, detention center, correction center, correctional facility, or remand center, is a facility where Prisoner, people are Imprisonment, imprisoned under the authority of the State (polity), state ...
, up to $50,000
fine
Fine may refer to:
Characters
* Fran Fine, the title character of ''The Nanny''
* Sylvia Fine (''The Nanny''), Fran's mother on ''The Nanny''
* Officer Fine, a character in ''Tales from the Crypt'', played by Vincent Spano
Legal terms
* Fine (p ...
, and
restitution
Restitution and unjust enrichment is the field of law relating to gains-based recovery. In contrast with damages (the law of compensation), restitution is a claim or remedy requiring a defendant to give up benefits wrongfully obtained. Liability ...
for the costs of the disruption.
New York law makes it a "Class E
Felony
A felony is traditionally considered a crime of high seriousness, whereas a misdemeanor is regarded as less serious. The term "felony" originated from English common law (from the French medieval word "''félonie''") to describe an offense that r ...
... to issue a false bomb threat directed toward a school in New York State." Even a false bomb threat has a maximum fine of $5,000 and up to 5 years in prison. In Orange County in North Carolina, a person may face "a felony charge, a 365-day suspension, revocation of his or her driver’s license, and a civil lawsuit of up to $25,000."
The current federal law regarding bomb threats applies to a person who "threatens by any means the placement or setting of a weapon of mass destruction."
Although there is some contention as to whether the law is overly broad, some current statutes making bomb threats illegal do not define a "threat," as a "true threat", meaning that the intent to use an actual bomb,
the existence of a target,
or the ability to convince the recipient that a bomb exists, is not relevant. This is because verbal acts which inherently cause panic are not protected under
Freedom of speech
Freedom of speech is a principle that supports the freedom of an individual or a community to articulate their opinions and ideas without fear of retaliation, censorship, or legal sanction. The rights, right to freedom of expression has been r ...
.
[ However, other sentencing guidelines apply only to "defendants whose conduct evidenced an intent to carry out the threat"
]
Society
Bomb threats are likely influenced by the power of suggestion and mass media, with threats likely to be made against targets with recent media coverage. Analysis suggests bomb threats against nuclear energy facilities tend to follow greater publicity of nuclear power problems. In the 6 months after the 1999 Columbine High School massacre
A school shooting and attempted bombing occurred on April 20, 1999, at Columbine High School in Columbine, Colorado, United States. The perpetrators, twelfth-grade students Eric Harris and Dylan Klebold, murdered 13 students and one teach ...
, there were a reported 5,000 bomb threats made against schools, with hundreds more made every year. Before 1999, there were roughly 1 to 2 threats a year, but by May 1999 a Gallup poll showed one fifth of teenage students experiencing a bomb threat evacuation. Because of copycat trends, some schools are moving toward policies of immediate criminal action against students caught making such threats, regardless of motivation. In addition, the FBI has created a campaign, namely “#ThinkBeforeYouPost”, and warns students not to post or send any threats against a school online.
Notable incidents
* 2006 NFL bomb threat hoax
* 2012 University of Pittsburgh bomb threats
* 2016 Australian school bomb threats
* 2017 Jewish Community Center bomb threats
* October 2018 United States mail bombing attempts
* 2018 Bitcoin bomb threats
* 2021 Ryanair Flight 4978 bomb threat hoax
See also
* Threat
A threat is a communication of intent to inflict harm or loss on another person. Intimidation is a tactic used between conflicting parties to make the other timid or psychologically insecure for coercion or control. The act of intimidation f ...
*Bomb
A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-transmitted mechan ...
* Death threat
* Swatting
References
{{DEFAULTSORT:Bomb Threat
Crimes
Emergency services
Speech crimes
Terrorism tactics
Civil defense