The shooting apparently took place at the Inland Regional Center, which is a facility that provides services for people who have developmental disabilities. The facility had just celebrated its Christmas party.

While details are scarce, what we have been told by authorities is that police are looking for 1-3 shooters and there are approximately 20 victims, with 12 being presumed dead.

Fox Los Angeles reports that the suspects are "white males" in "military gear" and armed with "rifles."

According to KTLA, police have warned people not to talk to the media. At one point during the KTLA live stream, the reporter attempted to interview a witness and multiple officers rushed up and pushed the reporters and the witnesses apart. Below is a screen grab from the live stream showing confrontation.