1 St. 1 Min, 15 Sept 2001 Jahr - Al Qaeda operatives hijacked four U.S. jetliners.
Two of the planes are crashed into the World Trade Center towers in New York, while another plane crashed into the Pentagon.
A fourth, presumably on the way to attack another target in Washington, crashed in a field in Pennsylvania after passengers and crew members fought the hijackers for control of the plane.
(September)