On September 11, 2001, extremist groups 


hijacked four airplanes and carried out suicide attacks


 against targets in the United States. 


Two of the planes were flown into the twin towers 


of the World Trade Center in New York City, 


a third plane hit the Pentagon 


just outside Washington, D.C., 


and the fourth plane crashed in a field in Pennsylvania.


Almost 3,000 people were killed 


during the 9/11 terrorist attacks. 


These attacks triggered major U.S. initiatives 


to combat terrorism.

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