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

A veteran investigator, a respected mentor and a skilled technician — the t hree arson investigators killed in an explosion at the Biscailuz Center in East LA were remembered as the “best of our department” by Los Angeles County Sheriff’s Department leaders.

An explosion at a Los Angeles County Sheriff's Department training facility on Friday killed three deputies, the sheriff said.