On 21 September 2008 at 10 pm local time, in the

Ghulam Khan Ghulām Khān (Pashto/) is a town in North Waziristan, Khyber Pakhtunkhwa, Pakistan. Ghulam Khan is on the border between Pakistan and Afghanistan. It is the third most important border crossing point between Pakistan and Afghanistan, after Wesh� ...

town of

North Waziristan District North Waziristan District ( ps, شمالي وزیرستان ولسوالۍ, ur, ) is a district of Khyber Pakhtunkhwa province in Pakistan. It is the northern part of Waziristan, a mountainous region of northwest Pakistan, bordering Afghanist ...

Pakistani soldiers fired on two American helicopter gunships that entered Pakistani airspace with 12.7 mm

heavy machine gun A heavy machine gun (HMG) is significantly larger than light machine gun, light, medium machine gun, medium or general-purpose machine guns. HMGs are typically too heavy to be man-portable (carried by one person) and require weapon mount, mountin ...

s. The helicopters stopped and hovered for a while, before returning over the border to Afghanistan without retaliation. It is unknown if any of the helicopters sustained any damage in this first incident. Thirty minutes later, two gunships attempted to cross the border again at the same place. Pakistani regular and

Frontier Corps The Frontier Corps ( ur, , reporting name: FC), are a group of paramilitary forces of Pakistan, operating in the provinces of Balochistan (Pakistan), Balochistan and Khyber Pakhtunkhwa, to maintain law and order while overseeing the country's ...

troops fired warning shots into the air and away from the helicopters, causing the helicopters to turn back without attacking any targets in Pakistan.Pak troops fire at US helicopters in N Waziristan
– ''ExpressIndia.com'', 22 September 2008

References

{{Reflist International incidents Pakistan–United States military relations