The September 11 attacks, also referred to as 9/11, happened on September 11, 2001. On that day, four coordinated terrorist attacks were carried out by the group al-Qaeda against the United States. The attacks began in the morning when hijacked planes were flown into the North and South Towers of the World Trade Center in New York City, the Pentagon in Washington, D.C., and a fourth plane crashed in Pennsylvania during a passenger revolt. The key attacks and events started around 8:46 a.m. and continued until about 10:28 a.m. on September 11, 2001, marking it as the date of the tragic event.
