(CNN) A gunman on a Navy air station in Florida shot and killed three people Friday and sources say the shooter was from Saudi Arabia.

The gunman, who was killed, was identified as Saudi national Mohammed Alshamrani, two law enforcement sources told CNN.

While it is still early in the investigation, here is what is known about the shooter.

What was he doing on the base?

The gunman was a second lieutenant in the Saudi military involved in flight training at Naval Air Station Pensacola, US Defense Secretary Mark Esper said.

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