A blast at a Los Angeles County Sheriff’s Department training facility killed three members of its arson and explosives unit Friday, marking one of the department's worst losses of life from a single incident, authorities said. All three were veteran deputies. The department has not said what they were doing at the time or what caused the explosion. Los Angeles County Sheriff Robert Luna said the arson and explosives team undergoes in-depth training and responds to more than 1,000 calls a year. Those killed were identified Friday evening by the department as Detective Joshua Kelley-Eklund, Detective Victor Lemus and Detective William Osborn. They served 19, 22 and 33 years in the department respectively, Luna said. MORE: https://www.wthr.com/article/news/nation-world/explosion-sheriffs-facility-los-angeles/507-39823b91-f731-413a-8d66-b0cb761ca9f9