A grenade has not been found and remains missing after last week's explosion that killed three L.A. County sheriff's detectives, the sheriff says.

A grenade is missing from the scene of an explosion that killed three Los Angeles County sheriff’s deputies. That’s according to Los Angeles County Robert Luna, who spoke at a Friday news conference.

A grenade is missing from the scene of an explosion that killed three Los Angeles County sheriff’s deputies, authorities said Friday. The July 18 blast at a sheriff’s department training facility killed three experienced deputies on the arson and explosives team.