A US sailor shot dead two workers before taking his own life at the Pearl Harbor military base near Honolulu in Hawaii on Wednesday 4th December.
Officials say the gunman also injured a third worker before he killed himself.
The incident prompted a lockdown at Joint Base Pearl Harbor-Hickam, which is on the Hawaiian island of Oahu.
The shooting was reported at about 14:30 (00:30 GMT) local time. The identities of those involved in the shooting have not yet been confirmed.
All three victims were civilian defence department employees and the survivor is in a stable condition, officials said.