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At least 14 people have been killed in a mass shooting in California involving up to three gunmen.
Officers said 17 people were also wounded in the attack at a social service centre in San Bernardino.
The gunmen, wearing military-style clothing and armed with long guns, opened fire at the Inland Regional Center, which helps adults with disabilities.
Witnesses said people locked themselves in offices as the gunfire rang out.
Hours after the attack, police hunting for the attackers riddled a black SUV with gunfire in a residential area several miles away.
San Bernardino Police Chief Jarrod Burguan tweeted: "Suspects are down, one officer wounded. Details still unfolding."
It is unclear if there is still a third suspect on the loose, but he warned residents in the area to stay inside.
Image copyright ABC Image caption Police fired multiple times at the dark SUV in San Bernadino The attack took place in a conference area where the San Bernardino County Department of Public Health was holding a social event, said Maybeth Field, the centre's president.
FBI officials said they do not yet know if it was a terrorist attack but local police said it might have been domestic terrorism.
"I think what they are getting at there, following the Paris attacks, is that they do not have any direct suggestion at this stage that this is an Islamist-style terrorist attack," said the BBC's James Cook who is at the scene. "Rather, if it is a terrorist attack it is perhaps some kind if home-grown terrorist attack here in the US."
He said that buses filled with people were being driven away from the scene, while the surrounding buildings remained closed with workers still sheltering inside.
Follow latest updates here
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."
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Media captionThe father of a woman trapped in the building talks about the text he received 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."
Image copyright AP Image copyright AFP People were seen being led out of the health care centre which specialises in helping adults with disabilities like autism and mental health problems.
Some were wheeled away on stretchers with medics and police officers in attendance.
Marcos Aguilera's wife was in the building when it happened. He said a gunman entered the building next to his wife's office.
"They locked themselves in her office. They seen bodies on the floor," he told a local ABC News station.
His wife escaped unharmed.
The shooting happened less than a week after a shooting at a Planned Parenthood clinic in Colorado left three people dead and nine people wounded.
Are you in San Bernardino? Are you near the scene of the incident? You can email your eyewitness accounts to haveyoursay@bbc.co.uk.
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Officers said 17 people were also wounded in the attack at a social service centre in San Bernardino.
The gunmen, wearing military-style clothing and armed with long guns, opened fire at the Inland Regional Center, which helps adults with disabilities.
Witnesses said people locked themselves in offices as the gunfire rang out.
Hours after the attack, police hunting for the attackers riddled a black SUV with gunfire in a residential area several miles away.
San Bernardino Police Chief Jarrod Burguan tweeted: "Suspects are down, one officer wounded. Details still unfolding."
It is unclear if there is still a third suspect on the loose, but he warned residents in the area to stay inside.
Image copyright ABC Image caption Police fired multiple times at the dark SUV in San Bernadino The attack took place in a conference area where the San Bernardino County Department of Public Health was holding a social event, said Maybeth Field, the centre's president.
FBI officials said they do not yet know if it was a terrorist attack but local police said it might have been domestic terrorism.
"I think what they are getting at there, following the Paris attacks, is that they do not have any direct suggestion at this stage that this is an Islamist-style terrorist attack," said the BBC's James Cook who is at the scene. "Rather, if it is a terrorist attack it is perhaps some kind if home-grown terrorist attack here in the US."
He said that buses filled with people were being driven away from the scene, while the surrounding buildings remained closed with workers still sheltering inside.
Follow latest updates here
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."
Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionThe father of a woman trapped in the building talks about the text he received 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."
Image copyright AP Image copyright AFP People were seen being led out of the health care centre which specialises in helping adults with disabilities like autism and mental health problems.
Some were wheeled away on stretchers with medics and police officers in attendance.
Marcos Aguilera's wife was in the building when it happened. He said a gunman entered the building next to his wife's office.
"They locked themselves in her office. They seen bodies on the floor," he told a local ABC News station.
His wife escaped unharmed.
The shooting happened less than a week after a shooting at a Planned Parenthood clinic in Colorado left three people dead and nine people wounded.
Are you in San Bernardino? Are you near the scene of the incident? You can email your eyewitness accounts to haveyoursay@bbc.co.uk.
Please include a contact number if you are willing to speak to a BBC journalist today. You can also contact us in the following ways:
- WhatsApp: +44 7525 900971
- Tweet: @BBC_HaveYourSay
- Send pictures/video to yourpics@bbc.co.uk
- Upload your pictures/video here
- Text an SMS or MMS to +44 7624 800100
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Your contact details Name Your E-mail address (required) Town & Country Your telephone number Comments (required) If you are happy to be contacted by a BBC journalist please leave a telephone number that we can contact you on. In some cases a selection of your comments will be published, displaying your name as you provide it and location, unless you state otherwise. Your contact details will never be published. When sending us pictures, video or eyewitness accounts at no time should you endanger yourself or others, take any unnecessary risks or infringe any laws. Please ensure you have read the terms and conditions.
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