Sheriff’s officials were warning the public Saturday to be on the lookout for a possibly live grenade — one of two that were found at a Santa Monica apartment building storage unit last week, after the other one detonated the following day in East Los Angeles, killing three sheriff’s detectives.

The device that exploded last week at a LASD facility and killed three detectives was a grenade, ABC News sources confirmed.

The investigation into the deaths of three L.A. County deputies, all killed by an explosion of military-style grenades thought to be inert, has made its way from Santa Monica to Marina del Rey

Arson and Explosives detectives believed two grenades found at the complex were inert, but took them to be destroyed and rendered safe.

Bomb squad investigators at a Santa Monica apartment building found what appeared to be grenades. The alleged grenades may be connected to the explosion at a Los Angeles County Sheriff's Department training facility that killed three deputies.