A police officer was taken to the hospital after being shot while responding to a barricade situation in Pomona on Friday night, fire officials said.
About 75 officers from other agencies responded to the scene but could not immediately get the wounded officers to safety because the suspect was still active, a law enforcement source said.
Los Angeles County sheriff's Capt. Christopher Bergner says the suspect remained barricaded Saturday morning in an apartment building in Pomona, about 30 miles (48 kilometers) east of Los Angeles. The deceased officer was identified Saturday afternoon as Gregory Casillas, 25, The Daily Bulletin reported.
Both officers were transported to a nearby hospital. He noted that he could not release further details because the investigation is ongoing.
The shootout begun after the suspect evaded police in a pickup, crashed and fled on foot.
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Around 9:10 p.m. local time dispatchers received a call of an "officer down", the Los Angeles Times reported. Crisis negotiators have been trying to talk to him, but have not yet been able to enter the scene, Bergner said. The man barricaded himself into a room inside an apartment and eventually shot through a door, wounding the two officers, Bergner said.
"The other officer is in serious condition and is undergoing surgery".
There have been 17 officers shot to death in the first 10 weeks of 2018, including an officer killed Tuesday in Missouri.
Outside the Los Angeles County coroner's office, dozens of police cars lined the streets and officers saluted as the slain officer's body was brought there in a procession Saturday morning.