HONOLULU (AP) — The Pearl Harbor Naval Shipyard was secured after a shooting Wednesday evening.

Officials at Joint Base Pearl Harbor-Hickam said a U.S. Sailor shot three Department of Defense civilian workers before shooting themself.

The sailor died. Base security and Navy investigative services are currently investigating.

The names of the victims will not be released until the next of kin have been notified.

The shipyard repairs, maintains and modernizes the ships and submarines of the U.S. Pacific Fleet, which is headquartered at Pearl Harbor. It’s the home port for 10 destroyers and 15 submarines.

The shipyard is across the harbor from the Pearl Harbor National Memorial, which on Saturday will mark the 78th anniversary of the Japanese attack that propelled the U.S. into World War II. More than 2,300 Americans died in the attack on Dec. 7, 1941.

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