A U.S. Navy sailor shot and killed two Department of Defense civilian employees and injured another at Joint Base Hickam Pearl Harbor in Hawaii on Wednesday afternoon. The shooter, a male U.S. Navy Sailor assigned to the USS Columbia (SSN 771), then shot himself.

Joint Base Pearl Harbor-Hickam tweeted that the incident took place at approximately 2:30 p.m. local time in the vicinity of the shipyard’s Dry Docks 2 and 3. Base security forces had responded to the shooting and the base was placed under lockdown.

The injured civilian employee is in stable condition at a local hospital, Joint Base Pearl Harbor-Hickam tweeted, adding the base is no longer under lockdown.

It said base security, Navy investigative services and other agencies are investigating the incident. The names of the victims will not be released until the next of kin have been notified.

The motive of the shooter and the weapon used were not known. It was also not known whether the victims were known to the shooter or were randomly targeted.

Hawaii Governor David Ige said the White House has reached out to offer assistance from federal agencies, and the state is standing by to assist where necessary.

Our thoughts are with the families of the victims and everyone involved,” said Rear Admiral Robert Chadwick, commander of Navy Region Hawaii. “This is certainly a tragedy for everyone here.”

The shooting comes just three days before the 78th anniversary of the World War 2 Japanese attack on Pearl Harbor. It occurred less than a mile from the memorial of the USS Arizona, which remains submerged as a monument to those that were killed on that fateful day which President Franklin D. Roosevelt described as being a date which would live in infamy.

Pearl Harbor Day Pictures
Sailors in a motor launch rescue a survivor from the water alongside the sunken battleship USS West Virginia during or shortly after the Japanese air raid on Pearl Harbor, Hawaii, Dec. 7, 1941. U.S. National Archives/Handout via Reuters