A U.S. Navy sailor shot and killed two civilian employees of the Defense Department and wounded a third before killing himself at Hawaii's Pearl Harbor military installation.

Rear Adm. Robert Chadwick, commander of Navy Region Hawaii, said the shooting occurred near Dry Dock 2 in the Naval shipyard at Joint Base Pearl Harbor-Hickam.

Chadwick said the male shooter "has tentatively been identified as an active-duty sailor assigned to USS Columbia," a nuclear-powered Los Angeles-class fast attack submarine.

Chadwick said the names of the shooter and his victims would not be released until next of kin had been notified. He said the wounded civilian is in stable condition at a local hospital.

A motive for the shootings has not been identified, and it is not known whether the victims were random or known to the shooter.

Joint Base Pearl Harbor-Hickam is home to nine Arleigh Burke-class destroyers, a guided missile cruiser and 15 attack submarines, plus the U.S. Air Force Pacific Command.

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