Three people have been killed after a shooting at the US Naval Air Station in Pensacola, Florida.
There have been "multiple injuries" according to the base.
The gunman has also died.
Eleven people were shot all together, including two sheriff's deputies who were the first to respond, one of whom killed the gunman, Escambia County Sheriff David Morgan said.
Commanding Officer of NAS Pensacola, Captain Timothy Kinsella said his "heart goes out to the families" of the victims.
"They were part of the Navy family," he added.
The base has been closed for the rest of Friday.
NAS Pensacola employs more than 16,000 military and 7,400 civilian personnel, according to its website.
US Vice President Mike Pence tweeted: "Saddened to hear of the horrible shooting at Naval Air Station Pensacola & continuing to monitor the situation.
"Praying for the victims & their families & we commend the first responders for their swift action in taking down the shooter & getting those on base to safety."
The incident comes a day after two people were killed by a US sailor at a military base at Pearl Harbor.
The attacker later took his own life.
Cover image: NAS Pensacola/Facebook.