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

Authorities are looking into whether grenades recovered from a Santa Monica apartment complex caused an explosion last week at a Los Angeles County Sheriff’s Department training facility that killed three members of its arson and explosives unit.

A veteran investigator, a respected mentor and a skilled technician — the three arson investigators killed in an explosion at the Biscailuz Center in East LA were remembered as the “best of our