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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