At least two people have been wounded after a US Navy sailor opened fire at the Pearl Harbor Naval Shipyard in Hawaii.
The gunmen later took his own life, officials said, adding that the injured were all civilians working for the US Department of Defence with two in "critical condition".
"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," Governor David Ige said on Twitter. "Details are still emerging as security forces at Joint Base Pearl Harbor Hickam investigate."
The base was placed on lockdown for about two hours following the incident.
Joint Base Pearl Harbor-Hickam is a combined US Air Force and Navy Installation located 13 km from Honolulu.
Saudi civil defence sends all-clear after alerts issued for capital Riyadh
11 Syrian soldiers killed in weapons depot explosion
Number of people displaced worldwide falls, UN says
White House turns away reporters after Trump's ban
Israeli strikes kill three people in Gaza, medics say
Trump says he will create 'AI Force,' name AI czar
Washington approves potential $2.7 billion air defence sale to Ukraine
US and Denmark reach deal on Greenland
