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: 4, Informative) by Thexalon on Thursday December 03 2015, @04:36AM
That's a big part of why training seems to be inversely related to how often a good guy with a gun fires their weapon. For example, a Marine with a pistol was at the Gabrielle Giffords shooting, and never even drew his weapon because he understood the risks of firing into the crowd. Whereas a wannabe vigilante shot up a parking lot trying to hit a shoplifter just a couple of weeks ago.
The only thing that stops a bad guy with a compiler is a good guy with a compiler.