BBC News wrote: sympathiser
Police are searching for up to three gunmen who killed at least 14 people at a facility for disabled people in California.
Officers said there were also a dozen wounded in the attack at the Inland Regional Center in San Bernardino.
It is still a "very active scene" and police were trying to find the suspects, said a police spokeswoman.
The gunmen may have fled the scene in a black SUV and may have had long guns, she said.
One man received a text from his daughter that said she was hiding inside the building, where she works.
Terry Petit told reporters his daughter wrote to him: "People shot. In the office waiting for cops. Pray for us. I am locked in an office."
President Barack Obama has responded to the shooting.
"One thing we do know is that we have a pattern of mass shootings in this country that has no parallel anywhere in the world," he said.
"There are some steps that we could take, not to eliminate all incidents, but to make sure they happen less frequently."
A local reporter tweeted that people were being evacuated from the Inland Regional Center, a medical and health organisation.
The organisation administers help to people with disabilities like autism and other mental health problems.
The shooting is happening less than a week after a shooting at a Planned Parenthood clinic in Colorado left three people dead and nine people wounded.
People are being seen wheeled away on stretchers with medics and police officers in attendance.
CNN reports that area hospitals are receiving at least 15 patients from the shooting.
An employee of the centre told CNN that the building was holding an event for county personnel inside an auditorium when the shooting occurred.
Representatives from the FBI and the Federal Bureau of Alcohol, Tobacco and Firearms are on the scene.
No arrests have been made yet.
There are also unconfirmed reports of an explosive device at the scene.
Witnesses told CNN they heard rapid shooting coming from nearby the building.
Police confirmed a report that the suspects entered a conference room in the building and started shooting but had no further details.
There are three buildings on the campus with more than 600 employees total, said Kristin Myricks, an employee of the centre who did not go to work today.
The facility has had active gunman training in the past. Badges are needed to enter the facility.