On Wednesday, a large US flag was unfurled at sunrise on one of the Pentagon's walls in a move to commemorate the victims of the 9/11 terrorist act.
The biggest terror act in modern US history occurred on 9 September 2001, when nearly 3,000 people were killed and 6,000 wounded after al-Qaeda terrorists* hijacked commercial airplanes and slammed them into the World Trade Centre in New York City and the Pentagon in Washington, DC. Another hijacked plane crashed in Shanksville, Pennsylvania.