The fourth plane crashed in a rural Pennsylvania field during a passenger revolt. The September 11 attacks killed 2, people, making it the deadliest terrorist attack in history. In response to the attacks, the United States waged the multi-decade global war on terror to eliminate hostile groups deemed terrorist organizations, as well as the foreign governments purported to support them.
Both collapsed within an hour and forty-one minutes, [ j ] bringing about the destruction of the remaining five structures in the complex and damaging or destroying nearby buildings.
American Airlines Flight 77 flew towards Washington, D. The fourth and final flight, United Airlines Flight 93 , also changed course towards Washington, believed by investigators to target either the United States Capitol or the White House.
Alerted to the previous attacks, the passengers revolted against the hijackers who crashed the aircraft into a field near Shanksville, Pennsylvania , at a. The Federal Aviation Administration ordered an indefinite ground stop for all air traffic in U. The actions undertaken in Canada to support incoming aircraft and their occupants were collectively titled Operation Yellow Ribbon. Bush that its Counterterrorism Center had identified the attacks as having been the work of al-Qaeda under Osama bin Laden.
The United States formally responded by launching the war on terror and invading Afghanistan to depose the Taliban , which rejected U. The U. He denied any involvement until , when excerpts of a taped statement in which he accepted responsibility for the attacks were released.
