A shooting was reported in the area of the 1400 block of Palomares Street shortly before 10 p.m., which prompted a heavy police response.
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You can hear at least five gunshots in video from the scene, which also shows a wounded officer lying on the ground while other officers apparently perform chest compressions.
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There was no word on the officers' condition. The Los Angeles County Sheriff's Department shared their thoughts and prayers for a wounded officer on Twitter.
Video at the scene showed an apparent pickup truck that had crashed into vehicles, and it was reported that a suspect may have ran into an apartment building before officers ran in after him. California Highway Patrol officials said there was a suspect inside a home in the area but would not release further details.
Pomona PD Chief Michael Olivieri tweeted that the scene remains active and SWAT officers have responded.
Detailed information on a suspect or suspects was not released.
DEVELOPING: We will add more details to this report as they become available.