11 September attacks
The terrorist attacks on 11 September 2001 were the deadliest to occur in the United States. Members of al-Qaeda hijacked four commercial aeroplanes; they crashed two of them into the twin towers of the World Trade Center in New York City, one into the Pentagon building near Washington DC, and the fourth crashed near Pittsburgh. The death toll was 2,753 in New York, 184 at the Pentagon, and 40 in Pennsylvania; all 19 terrorists died.