Terrorist Attacks on the U.S.
Plumes of smoke pour from the World Trade Center buildings in New York Tuesday, Sept. 11, 2001. Planes crashed into the upper floors of both World Trade Center towers minutes apart Tuesday in a horrific scene of explosions and fires that left gaping holesin the 110-story buildings. The Empire State building is seen in the foreground. (AP Photo/Patrick Sison)

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