As America reflects on the September 11 attacks of 2001, here are some of the iconic images from that tragic day.
A look back at September 11, 2001 attack.
The rubble of the World Trade Center smoulders following a terrorist attack.
The second tower of the World Trade Centre explodes after being hit by a hijacked airplane in New York.
People walk away from the World Trade Center tower. Three hijacked planes crashed into U.S. landmarks, destroying both of New York's mighty twin towers and plunging the Pentagon in Washington into flames.
Rescue workers carry fatally injured New York City Fire Depatment Chaplain, Fether Mychal Judge, from one of the World Trade Center towers.