Multiple people have reportedly been injured and four killed after a gunman opened fire on a US naval base.
The shooter was taken down just minutes after he opened fire in the Pensacola naval base in Florida.
Aside from the shooter three other people have been confirmed dead.
The base was put on lockdown at around 6.45am local time as the authorities rushed to deal with the threat.
Two hours later the Escambia County Sheriff's Office announced the shooter had been killed.
"One additional fatality has been confirmed," the Navy said in a statement.
"Unknown number of injured people being transferred to local hospitals."
Nine patients were admitted to Baptist Hospital in Pensacola but their conditions are not currently known, a hospital spokesperson said.
The Naval Air Station wrote on Twitter that the names of the victims will not be released until the next of kin have been notified.
Six patients were taken to the trauma center at Ascension Sacred Heart Hospital.
A warning for those in and around the base was sent out on its official Facebook account.
"Both gates of NASP are currently secured due to reports of an active shooter. More information will be provided as it becomes available," NAS Penscola posted.
The base continues to be on lockdown as the scene is secured. Only essential personnel will be allowed on base for the remainder of the day.
Base spokesman Jason Bortz said both gates were closed and the base was on lockdown.
NAS Pensacola employs more than 16,000 military and 7,400 civilian personnel, according to its website.
On Wednesday, a sailor shot three civilians at the historic Pearl Harbor military base in Hawaii, killing two of them before taking his own life.
The suspected shooter opened fire on shipyard personnel with his M4 service rifle and then used his M9 service pistol to shoot himself.
