The September 11 attacks were the deadliest terrorist attacks in
human history, causing the deaths of 2,996 people, including
2,977 victims and 19 hijackers who committed murder–suicide.

Thousands more were injured, and long-term health effects have
arisen as a consequence of the attacks. New York City took the
brunt of the death toll when the Twin Towers of the World Trade
Center complex in Lower Manhattan were attacked, with an
estimated 1,600 victims from the North Tower and around a
thousand from the South Tower.

Two hundred miles southwest in Arlington County, Virginia,
another 125 were killed in the Pentagon. The remaining 265
fatalities included the ninety-two passengers and crew of
American Airlines Flight 11, the sixty-five aboard United
Airlines Flight 175, the sixty-four on American Airlines Flight
77 and the forty-four who boarded United Airlines Flight 93.

The attack on the World Trade Center’s North Tower alone
made the September 11 attacks the deadliest act of terrorism
in human history.
From Wikipedia, the free encyclopedia