Four people have been killed and several others injured after a gunman believed to be from Saudi Arabia opened fire at a major US navy base in Florida.
The gunman was among those dead when he was shot a few minutes after the incident in Pensacola, Florida, the second shooting at a US Navy base this week
At least 11 people have been injured including two sheriff's deputies who were the first to respond, one of whom killed the gunman, Escambia County Sheriff David Morgan said.
He added that one of the deputies was shot in the arm and the other in the knee and both were expected to recover following the incident in a classroom building.
Mr Morgan refused to say if the gunman was a member of the military and would not comment on whether the shooting was linked to terrorism.
The base remains closed and those still on site will remain there until it is safe to evacuate, said commanding officer Captain Timothy Kinsella Jr.
More than 16,000 military and 7,400 civilian personnel are employed at NAS Pensacola, according to its website.
The shooting is the second at a US naval base this week after a sailor whose submarine was docked at Pearl Harbour, Hawaii, opened fire on three civilian employees, killing two before he took his own life.
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."
US President Donald Trump was being kept informed of the incident, a White House spokesman said.