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,

At least three people have died in an explosion at a Los Angeles County Sheriff’s Department’s training facility on Friday morning, according to US Attorney General Pam Bondi.