HONOLULU (AP) – UPDATE: Two civilian shipyard workers at Joint Base Pearl Harbor-Hickam in Honolulu were killed by a US sailor on Wednesday, Rear Adm. Robert Chadwick told reporters.

The shooter then killed himself, Chadwick said. A third civilian employee was wounded and is stable at a hospital, Chadwick added.

UPDATE: A U.S. sailor shot and wounded three civilian Department of Defense employees at the Pearl Harbor shipyard Wednesday before taking their own life, the military said.

Joint Base Pearl Harbor-Hickam, one of the Navy’s major installations, said the shooting began around 2:30 p.m. at Pearl Harbor Naval Shipyard. The military didn’t release a motive or any identifying information about the sailor who opened fire.

Two hospitals said they were each treating a victim but didn’t have details on their conditions.

The base has reopened following a lockdown.

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

Hawaii Gov. David Ige said the White House has offered assistance from federal agencies and that the state is also ready to help if needed.

“I join in solidarity with the people of Hawaii as we express our heartbreak over this tragedy and concern for those affected by the shooting,” Ige said in a statement.

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.

ORIGINAL STORY: The U.S. military says security forces are responding to reports of a shooting at a naval shipyard at Pearl Harbor, one of the Navy’s major installations.

Joint Base Pearl Harbor-Hickam tweeted that there’s an ongoing security incident at Pearl Harbor Naval Shipyard that began around 2:30 p.m. Wednesday.

Honolulu firefighters were responding to the base, Capt. Scot Seguirant said.

It’s not clear if there are injuries.

The shipyard is across the harbor from the Pearl Harbor National Memorial, which on Saturday will mark the 78th anniversary of the attack by Japan that propelled the U.S. into World War II.

Pearl Harbor houses the headquarters for the U.S. Pacific Fleet and is the home port for 10 destroyers and 15 submarines.