OAKLAND, Calif. (KGO) -- A witness describes the scene as BART's 12th Street Station was temporarily shut down for a police search after shooting at Tanforan Ball in San Bruno.
She says it was a crowded train.
"We got to 12th street - The doors didn't open," she said.
The operator announced there was police activity and that their train was being held until further notice.
The all of a sudden, "'all these police came down with their weapons drawn."
Watch the video posted above to hear the whole story.
Get the latest updates on the San Bruno mall shooting here.