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

The deputies, with 19, 22, and 33 years of service, were described as highly trained experts. No one else was injured.

An explosion at a Los Angeles County Sheriff’s Department training facility killed three veteran members assigned to the agency’s arson and explosives detail Friday morning – a tragedy that marks the “largest loss of life” at the department since 1857,