The September 11 attacks (also referred to as September 11, September 11th or 9/11) were a series of four coordinated suicide attacks that were committed in the United States on September 11, 2001, striking the areas of New York City and Washington, D.C. On that Tuesday morning, 19 terrorists from the Islamist militant group Al-Qaeda hijacked four passenger jets. The hijackers intentionally piloted two of those planes, American Airlines Flight 11 and United Airlines Flight 175, into the Twin Towers of the World Trade Center complex in New York City; both towers collapsed within two hours. The hijackers also intentionally crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia, and intended to pilot the fourth hijacked jet, United Airlines Flight 93, into a target in Washington, D.C.; however, the plane crashed into a field near Shanksville, Pennsylvania after its passengers attempted to take control of the jet from the hijackers. Nearly 3,000 people died in the attacks.