UPDATE: Navy hospital shooting ruled false alarm, according to Capt. Curt Jones, commanding officer of Naval Base San Diego.
An active shooter was reported Tuesday at the Naval Medical Center San Diego, according to the center's Facebook page.
The message advises occupants to "run hide or fight." Non-emergency response personnel were asked to avoid the compound at 34800 Bob Wilson Drive. The center posted that the shooter was believed to be in Building 26.
According to intitial reports, three shots were heard in the basement of the building, which is a combination of a gym and barrack. There are no reports of injuries.
Fox 5 San Diego reports that three nearby schools are on lockdown.
The U.S. Navy could not immediately confirm the report.
The facility has a staff of more than 6,500 military and civilian personnel, and aims to provide medical care to military service members, their families, and those who served in the past, according to its website.
"We're not taking any chances and are executing procedures we've been trained for in this kind of situation," Naval Medical Center spokesman Mike Alvarez said.