An active shooting in a classroon building at the Naval Air Station in Pensacola left four dead, including the gunman and four others injured, early Friday morning.
Two sheriff's deupites were among those injured.
Official say the shooter was an aviation student from Saudi Arabia named Mohammed Saeed Alshamrani. Authorities are investigating whether the shooting was terrorism-related.
The shooting occurred around 6:30 a.m., prompting a lockdown at the base.
According to an AP source, the Navy sailor was undergoing counseling, was unhappy with commanders.
"I can confirm there is an active shooter on NAS Pensacola and it's going on right now," said Amber Southard, a sheriff's office spokeswoman.
The base remains on lockdown and according to a post on the station's Facebook page, the gates to the station have been "secured," but "more information will be provided as it becomes available."
The incident occurred just two days after an active duty US sailor killed two civilian employees and injured another before killing himself at Pearl Harbor Naval Shipyard in Hawaii.
This is a developing story.