1) The September 11 attacks were a series of airline hijackings attacks committed in 2001 by 19 terrorists associated with the Islamic extremist group al-Qaeda. It was the deadliest terrorist attack on U.S. soil; nearly 3,000 people were killed.

2) Brian Clark was one of only 18 people in the South Tower to escape from a floor where the plane struck

3) Three buildings in the World Trade Center collapsed due to fire-induced structural failure. The South Tower collapsed at 9:59 a.m. having burned for 56 minutes in a fire caused by the impact of United Airlines Flight 175 and the explosion of its fuel. The North Tower collapsed at 10:28 after burning for 102 minutes.

4) The 9/11 terrorist attacks on America caused significant economic damage in the immediate aftermath, rippling through global financial markets. Airlines and insurance companies took the hardest immediate hit, and U.S. stock markets initially fell more than 10% in the days after.

Explanation:

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