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September 11, 2001 marked the deadliest terrorist attack on American soil. That morning, four coordinated terrorist attacks were executed. Four passenger airliners, operated by United Airlines and American Airlines, were hijacked by 19 al-Qaeda terrorist. Two of the four planes crashed into the North and South towers of the World Trade Center complex, also known as the twin towers, in New York City. Less than two hours after the two planes made impact, both towers collapsed. That resulted in the collapse and partial collapse of all other buildings in the World Trade Center complex.
A third plane crashed into the Pentagon which resulted in a partial collapse of the building's western side. The fourth plane crashed into a field in Pennsylvania after its passengers rebelled against the hijackers. In total, the attacks killed 2,997 people and injured more than 6,000.
Known as "9/11," the attack marked the single deadliest incident for firefighters and law enforcement officers in the history of the United States. In the terrorist attack’s aftermath, America and President George W. Bush launched the War on Terror, and invaded Afghanistan to target al-Qaeda.