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

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.

A deadly explosion at a Los Angeles County Sheriff's Department training facility in Monterey Park resulted in the tragic deaths of three deputies. The incident, believed to be accidental, prompted a swift response from emergency services and the involvement of the FBI and Department of Homeland Security.