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.
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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.
San Bruno mall shooting: Woman stuck on BART train describes police search at 12th St. Station