3 LA sheriff’s deputies killed in explosion at training facility in department’s biggest loss of life since 1857

Three Los Angeles County sheriff’s deputies assigned to the arson explosives detail were killed in an explosion at a law enforcement training facility on Friday, the sheriff said.

These fatalities at the Biscailuz Training Center in Monterey Park mark the largest loss of life incident for the LA County Sheriff’s Department since 1857, Sheriff Robert Luna said at a news conference.

No one else was hurt, the sheriff said, and the bomb squad has rendered the scene safe.

The cause of the explosion is not known, the sheriff said.

Multiple law enforcement sources briefed on the investigation told ABC News that it appears the explosive had been brought back to the facility from a seemingly routine bomb squad callout and was believed to have been inert when it exploded.

Luna called it an isolated incident and said there’s no threat to the community.

The Biscailuz Training Facility, where an explosion occurred, is shown on July 18, 2025, in Los Angeles.

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