Three veteran Los Angeles County Sheriff’s Department members assigned to the agency’s arson and explosives detail were killed Friday morning by an explosion at a department training facility, according to Sheriff Robert Luna.

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.