UPDATE @ 8 p.m.
Travis Air Force Base is on lock for what the base calls a “security incident.”
The base issued a security alert shortly after 3:30 p.m. (6:30 p.m. EDT) asking people to shelter in place and to lock doors and windows.
Marie Lowe, a civilian who answered the phone at the base's public affairs office, said details are sketchy and officials are investigating because they don't know exactly what is going on, the Associated Press reported
Base officials used social media, posting on its Facebook page, to ask the public to stay away to ensure emergency responders can do their work. The base is northeast of San Francisco.
Travis Air Force Base is under a security alert tonight due to a “real world security incident.”
The Air Force Base had training exercises planned for today and Thursday, but an official said the alert and lockdown is unrelated, CBS Sacramento reported.
A witness at the scene told the television station there is an active shooter situation at the shopping center on the base, and that security is in the parking lot and guiding people outside from the shopping center.
A CBS 13 reporter near the base said he could hear alerts for the lockdown being called out over a loudspeaker.
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