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A heavily armed officer sets up a perimeter near the site of the shootings.

The shootings took place at the Inland Regional Center, a facility for people with developmental disabilities.

First responders gather on a nearby street corner where victims were treated.

Police officials described the shootings as 'domestic terrorism' but a motive has not been identified.

Ambulances at the scene of the shootings.

A law enforcement officer walks down a street near the scene.

People celebrate the new year during a countdown event at Yongdingmen Gate in Beijing, China, Jan. 1, 2018.

A spent cartridge lies on the ground.

Police officers escort bystanders away.

Witnesses and bystanders are transported away from the area.

Several local law enforcement agencies responded to the shootings, and federal agents, including the FBI, are on the scene.

Law enforcement officials with armored vehicles search an area near where police stopped a suspect SUV.