An explosion at a Los Angeles County Sheriff's Department training facility Friday left three deputies dead, officials said.The blast was reported just before 7:30 a.m. Pacific and occurred at the Biscailuz Center Training Academy in East L.

Three Los Angeles County sheriff’s deputies assigned to the arson explosives detail were killed in an explosion at a law enforcement training facility on Friday, the sheriff said. These fatalities at the Biscailuz Training Center in Monterey Park mark the largest loss of life incident for the LA County Sheriff's Department since 1857,

Multiple people are dead after an explosion at an LASD facility on Friday morning around 7:30 a.m. local time. The Federal Bureau of Investigation's Los Angeles office is investigating.