UPDATE: ‘12 dead, many injured’ in California shooting rampage

A swat team arrives at the scene of a shooting in San Bernardino, Calif., on Wednesday, Dec. 2, 2015. Police responded to reports of an active shooter at a social services facility. (Doug Saunders/Los Angeles News Group via AP) MANDATORY CREDIT

Lieutenant Rich Lawhead said today there are reports of multiple victims.

No arrests have been made and Sergeant Vicky Cervantes says police are working to secure the scene in the inland region east of Los Angeles.

Reports say there are up to three gunmen involved.

The San Bernardino Fire Department tweeted that it was responding to a “20 victim shooting incident” and it was working to clear the scene. Reports said 12 had died and many others were injured with some people locking themselves in offices for protection.

It is still a “very active scene” and police are trying to secure the building, said a spokeswoman from the San Bernardino Police Department.

There may be up to three gunmen she said, and the shooters were heavily armed and possibly wearing body armour.

She did not confirm the number of victims.

A local reporter tweeted that people are being evacuated from the Inland Regional Center, a non-profit medical and health organisation.

A petrol station manager near the site said there is a flood of police activity in the area.

Ana Fuentes, manager of a Shell station about a block from the scene, estimated that there are about 150 police officers flooding the area.

She said she has not got any instructions to stay inside but that customers coming in told her about the shootings at Inland Regional Centre.

The centre says on its website that it provides social services to people with developmental disabilities.

Dozens of people filed out of the scene, holding their hands in their air. Other people were seen being wheeled away on trollies.

Terry Petit said he got a text from his daughter saying she was hiding after gunfire erupted at the facility where she works.

Mr Petit choked back tears as he read the texts for reporters.

He says she wrote: “People shot. In the office waiting for cops. Pray for us. I am locked in an office.”

Police searched people filing out of a building with their hands up before they were reunited with loved ones.

Ambulances and law enforcement vehicles were racing through the area with sirens blaring.