One of two grenades taken to a Los Angeles County Sheriff’s Department facility detonated last week and killed three detectives, but the second grenade remains unaccounted for, the sheriff said Friday.

Authorities are searching for a missing “military-style” grenade linked to an explosion that killed three Los Angeles sheriff’s deputies last week.

The department said it's working to confirm whether an apparent grenade discovered in Santa Monica on Thursday night caused the explosion that killed three deputies Friday.