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: 2) by Runaway1956 on Thursday December 03 2015, @03:20AM
That is the bit that gun control nuts always fail to understand. The nutcase who wants to kill a bunch of people almost always goes to the gun free zones. He knows that he's unlikely to meet anyone there who is prepared to resist him. Again and again, the murderers find that they can kill people just as fast as they can aim and pull the trigger. Sometimes, they don't even have to aim - gun free zones are so target rich, there's little need to aim.
If there's a crazed madman within fifty miles of a gun free zone, he feels the call from it.