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

The Los Angeles County Sheriff's Department (LASD) has identified the three detectives who were killed in an explosion at a training facility on July 18 as Joshua Kelley-Eklund, Victor Lemus and William Osborn.

Lemus is survived by his wife, LASD Detective Nancy Lemus, and three daughters. He has three sisters who are also in the department. He is also survived by his brothers Alfredo, Pedro, Juan, and Efren and brother-in-law Sgt. Robert Catalan, who is assigned to the LASD’s Carson station.

The Los Angeles County Sheriff's Department is in mourning Saturday for three detectives killed in an explosion at a training facility in East Los Angeles in the agency's deadliest day since 1857.

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.