The 9/11 attacks occurred on September 11, 2001. Four coordinated terrorist attacks were carried out by al-Qaeda in the United States. The key events happened on that morning with the first plane crashing into the North Tower of the World Trade Center at 8:46 a.m., followed by the second plane hitting the South Tower at 9:03 a.m. The third plane crashed into the Pentagon at 9:37 a.m., and the fourth plane was crashed in a field in Pennsylvania at 10:03 a.m. after passengers attempted to regain control. This day marked the deadliest terrorist attack in U.S. history, killing 2,977 people.
