Four passenger airliners which had departed from airports in the northeastern United States bound for California were hijacked by 19 al-Qaeda terrorists. Two of the planes, American Airlines Flight 11 and United Airlines Flight 175, crashed into the North and South towers, respectively, of the World Trade Center complex in Lower Manhattan. Within an hour and 42 minutes, both 110-story towers collapsed. Debris and the resulting fires caused a partial or complete collapse of all other buildings in the World Trade Center complex, including the 47-story 7 World Trade Center tower, as well as significant damage to ten other large surrounding structures. A third plane, American Airlines Flight 77, was crashed into the Pentagon (the headquarters of the U. S. Department of Defense) in Arlington County, Virginia, which led to a partial collapse of the building’s west side. The fourth plane, United Airlines Flight 93, was initially flown toward Washington, D. C. , but crashed into a field in Stonycreek Township, Pennsylvania, after passengers thwarted the hijackers.

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