U.S. Sailors bow their heads aboard the amphibious transport dock ship USS San Diego (LPD 22) in the U.S. 7th Fleet area of responsibility Sept. 11, 2014, during a moment of silence in remembrance of the victims of the 9/11 terrorist attacks. Terrorists hijacked four passenger aircraft Sept. 11, 2001. Two of the aircraft were deliberately crashed into the World Trade Center in New York; one was crashed into the Pentagon; the fourth crashed near Shanksville, Pa. Nearly 3,000 people died in the attacks.