A solemn memorial was held in Washington to commemorate the victims and families of the Sept. 11, 2001, terrorist attacks, which killed 2,997 people and injured more than 6,000.
In New York, the World Trade Center was destroyed by terrorists flying planes hijacked from American Airlines, Flight 11 and Flight 175. In Washington, a third plane, Flight 77, was hijacked and crashed into the Pentagon. And a fourth plane, Flight 93, was steered toward Washington but crashed instead in Pennsylvania, after passengers fought back against the hijackers.