UPDATE 1:41 p.m.: A sweep of Building 26 in the Navy Medical Center San Diego has yielded no indications of gunshots or an active shooter, a Navy Region spokesman revealed to the Navy Times.
"[Authorities] have not located any casualties or evidence of a shooting having taken place," Navy Region Southwest spokesman Scott Sutherland said. "They are conducting a secondary, more thorough floor-by-floor sweep now."
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A possible active shooter has been reported at the Naval Medical Center San Diego in its military hospital Tuesday morning, with officials urging workers at the facility to either "run, hide, or fight."
NMCSD posted the warning on its Facebook page this morning 8:10 a.m. local time
"**!ATTENTION!** An active shooter has just been been reported in building #26 at Naval Medical Center San Diego. All occupants are advised to run, hide or fight. All non-emergency response personnel are asked to stay away from the compound, located at 34800 Bob Wilson Drive, San Diego, CA 92134."
The shooter is believed to be in Building 26 and there are no immediate reports of casualties. The facility itself has staff comprised of more than 6,500 military, civilian, contractor and volunteer personnel, reported NBC San Diego. Personnel there are typically deployed to Iraq, Afghanistan, Kuwait, Djibouti and the aboard the USNS Mercy.
In the meantime, due to their proximity to the site of the reported shooting, San Diego High School, Garfield High School and Roosevelt Middle School have all been locked down, reported FOX 5 San Diego.
"Parents should be reassured that their kids are safe and we are monitoring the situation closely," said NMCSD spokeswoman Linda Zintz, noting that parents should remain at home as to not create a chaotic situation outside the schools.
It's unclear how many people were inside the building at the time of the shooting.