The September 11 attacks injured over 6,000 people and it was one of the deadliest attacks in U.S. history.
During the September 11 attacks in 2001 , 2,996 people were killed and more than 6,000 others wounded . September 11 attacks . The attacks killed 2,996 people , injured over 6,000 others , and caused at least $ 10 billion in property and infrastructure damage . It was the deadliest incident for firefighters and law enforcement officers in the history of the United States , with 343 and 72 killed respectively .