A US sailor fatally shot two people and wounded a third at the Pearl Harbor Naval Shipyard in Hawaii on Wednesday before taking his own life, a senior Navy officer said. The base was locked down for more than an hour after the shooting, according to a statement issued by the facility, while Navy officials said they were investigating what prompted the attack. The shooting took place at 2:30 pm local time near the south entrance of the sprawling base located on the southern shore of Oahu. The base hosts both the Navy and Air Force. It unfolded three days before the 78th anniversary of the 1941 Japanese surprise attack on Pearl Harbor that left more than 2,400 US service members dead.