Investigators say they are following leads to determine the origin of grenades that were discovered inside a Santa Monica storage area and transported to East L.A., where the explosion occurred Friday.

Serving the search warrant were sheriff’s homicide investigators, the Bureau of Alcohol, Tobacco, Firearms and Explosives, and the Los Angeles Police Department. It was unclear exactly where the

An explosion at a Los Angeles County Sheriff's Department training facility on Friday killed three deputies, the sheriff said. The explosion took place at the Biscailuz Center Academy Training in East Los Angeles,