Police are attending a shooting in California, with reports of 20 victims, say officials.
Fire officials in San Bernardino said it was responding to a "20 victim shooting incident" and it was working to clear the scene.
ABC News reports that there are 12 people dead but police have not confirmed that number.
It is still a "very active scene" and police are trying to secure the building, said a police spokeswoman.
There may be up to three gunmen, she said, and they were heavily armed and possibly wearing body armour.
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Update 1: BBC Live stream updates
(Score: 0) by Anonymous Coward on Thursday December 03 2015, @06:42PM
I haven't voted on any gun control legislation. Do try to pay attention and keep up, mmmkay?
True story: yesterday, when I first heard about this story, my office was in lockdown because there were reports of an active shooter in the building just south of us. The "paid thugs" showed up almost immediately to take care of business. Luckily, it turned out to be a false alarm.