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As millions watched the events unfolding in New York, American Airlines Flight 77 circled over downtown Washington, D.C., before crashing into the west side of the Pentagon military headquarters. Jet fuel from the Boeing 757 caused a devastating inferno that led to the structural collapse of a portion of the giant concrete building, which is the headquarters of the U.S. Department of Defense. All told, 125 military personnel and civilians were killed in the Pentagon, along with all 64 people aboard the airliner.
The fourth plane crashed in Shanksville, Pennsylvania. Officials believe that the terrorists on that plane intended to destroy either the White House or the U.S. Capitol. Passengers on the plane fought the terrorists and prevented them from reaching their goal. In all, nearly 3,000 people were killed in the 9/11 attacks.
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