The 9/11 terrorist attacks were carried out by the Islamic Extremist group Al-Qaeda who hijacked four airplanes and carried out suicide attacks against targets in the United States. Two of the planes crashed into the twin towers of the World Trade Center, while the third hit the Pentagon and the fourth crashed in a field in Pennysylvannia. Nearly 3,ooo people were killed in these attacks thus setting the U.S strategies to fight terrorism.
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