Oversight officials say the L.A. County Sheriff’s Department is blocking access to some shootings by deputies, despite state laws that authorize them to conduct meaningful investigations.

The department said it's working to confirm whether an apparent grenade discovered in Santa Monica on Thursday night caused the explosion that killed three deputies Friday.

LOS ANGELES – At least three people were killed Friday in an explosion at the Los Angeles County Sheriff’s Department’s Biscailuz Training Center, according to law enforcement sources.