9/11 Memorials Mark 20th Anniversary of Attacks
Americans commemorated the victims of the 2001 terrorist attacks with events in lower Manhattan, near Shanksville, Pa., and at the Pentagon in Arlington, Va. Photo: Mike Segar/AFP
Americans commemorated the victims of the 2001 terrorist attacks with events in lower Manhattan, near Shanksville, Pa., and at the Pentagon in Arlington, Va. Photo: Mike Segar/AFP