On Sept. 11, 2001, Islamist terrorists attacked the United States, crashing two hijacked airliners into the Twin Towers at New York's World Trade Center and another into the Pentagon outside Washington, and a fourth crashed in Pennsylvania. On This Day, Sept. 11: U.S. terror attacks leave nearly 3,000 dead
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On Sept. 11, 2001, Islamist terrorists attacked the United States, crashing two hijacked airliners into the Twin Towers at New York's World Trade Center and another into the Pentagon outside Washington, and a fourth crashed in Pennsylvania. 
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