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9/11 Terrorist Attacks
The September 11 attacks (also referred to as September 11, September 11th, or 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States in New York City and the Washington, D.C., metropolitan area on Tuesday, September 11, 2001. The attacks killed 2,996 people and caused at least $10 billion in property and infrastructure damage. Four passenger airliners were hijacked by 19 al-Qaeda terrorists to be flown into buildings in suicide attacks. Two of the planes, American Airlines Flight 11 and United Airlines Flight 175, were crashed into the North and South towers, respectively, of the World Trade Center complex in New York City. Within two hours, both 110-story towers collapsed with debris and the resulting fires causing partial or complete collapse of all other buildings in the WTC complex, including the 47-story 7 World Trade Center tower, as well as significant damage to ten other large surrounding structures. A third plane, American Airlines Flight 77, was crashed into the Pentagon (the headquarters of the United States Department of Defense), leading to a partial collapse in its western side. The fourth plane, United Airlines Flight 93, was targeted at Washington, D.C., but crashed into a field near Shanksville, Pennsylvania after its passengers tried to overcome the hijackers. In total, 2,996 people died in the attacks, including the 227 civilians and 19 hijackers aboard the four planes. It was the deadliest incident for firefighters and law enforcement officers in the history of the United States, with 343 and 72 killed respectively. Suspicion quickly fell on al-Qaeda. Although the group's leader, Osama bin Laden, initially denied any involvement, in 2004, he claimed responsibility for the attacks. Al-Qaeda and bin Laden cited U.S. support of Israel, the presence of U.S. troops in Saudi Arabia, and sanctions against Iraq as motives. The United States responded by launching the War on Terror and invading Afghanistan to depose the Taliban, which had harbored al-Qaeda. Many countries strengthened their anti-terrorism legislation and expanded law enforcement powers. Having evaded capture for almost a decade, bin Laden was located and killed by U.S. forces in May 2011. The destruction of the Twin Towers and other properties caused serious damage to the economy of Lower Manhattan and had a significant effect on global markets, closing Wall Street until September 17 and the civilian airspace in the U.S. and Canada until September 13. Many closings, evacuations, and cancellations followed, out of respect or fear of further attacks. Cleanup of the World Trade Center site was completed in May 2002, and the Pentagon was repaired within a year. Numerous memorials have been constructed, including the National September 11 Memorial & Museum in New York, the Pentagon Memorial, and the Flight 93 National Memorial in Pennsylvania. On November 18, 2006, construction of One World Trade Center began at the World Trade Center site. The building was officially opened on November 3, 2014.
