The Los Angeles County Sheriff's Department served a search warrant in Marina del Rey to follow up on leads stemming from the deadly explosion that killed three deputies.

Video showed a high-tech bomb robot being used at the scene. Bomb squad technicians rigged up ropes on a pulley system to open a garage door.

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.

The Los Angeles Sheriff’s Department was executing a search warrant Friday at a Santa Monica residence related to the investigation of an explosion in East LA.

Officers spent hours searching a Santa Monica apartment building where the device that exploded and killed three deputies may have originally come from.

Following the Friday morning explosion, a task force consisting of the Los Angeles Police Department Bomb Squad, ATF, FBI and LASD returned to the Santa Monica neighborhood to serve a search warrant to find any additional explosive materials,

A Santa Monica police officer told detectives Arson and Explosives detectives believed two grenades found at the complex were inert, but took them to be destroyed and rendered safe.

Authorities are now focusing on a Santa Monica apartment where ordnances had been recovered a day before the fatal explosion

Eklund, Victor Lemus and William Osborn were killed in an explosion on Friday. A local apparel company is raising money to help their families.