19 militants associated with the Islamic extremist group al Qaeda against targets in the United States, the deadliest terrorist attacks on American

al Qaeda 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

the fourth plane crashed in a field in Shanksville, Pennsylvania. Almost 3,000 people were killed during the 9/11 terrorist attacks. Some 2,750 people were killed in New York, 184 at the Pentagon, and 40 in Pennsylvania.

The emotional distress caused by the attacks—particularly the collapse of the twin towers, New York City’s most visible landmark—was overwhelming.

al Qaeda terrorist organization they were allegedly acting in retaliation for America’s support of Israel, its involvement in the Persian Gulf War and its continued military presence in the Middle East.

The September 11 attacks were precipitated in large part because Osama bin Laden, the leader of the militant Islamic organization al-Qaeda, held naive beliefs about the United States in the run-up to the attacks.

On December 18, 2001, Congress approved naming September 11 “Patriot Day” to commemorate the anniversary of the 9/11 attacks. In 2009, Congress named September 11 a National Day of Service and Remembrance. ic

September 11 attacks, also called 9/11 attacks, series of airlinhijackings and suicide attacks committed in september 11 2001.