U.S. Marks 21st Anniversary Of 9/11 Terror Attacks

Watch VideoAmericans are remembering 9/11 with moments of silence, readings of victims' names, volunteer work and other tributes 21 years after the deadliest terror attack on U.S. soil.

Victims' relatives and dignitaries will convene Sunday at the places where hijacked jets crashed on Sept. 11, 2001 — the World Trade...