Three members of the Los Angeles County Sheriff's Department's Arson/Explosives Detail were killed Friday morning in an explosion at a training facility in East Los Angeles, authorities said.

A 46-year-old man was arrested for investigation of arson on Friday, after police said he set fire to an encampment in West Seattle.

The explosion took place at the Biscailuz Center Academy Training in East Los Angeles, the department said in a statement, without releasing more details.

The Los Angeles Police Department says they are investigating the crash as an intentional act, saying the driver made a U-turn before slamming into the crowd.

A vehicle rammed into a crowd of people waiting to enter a nightclub along a busy boulevard in Los Angeles early Saturday, injuring 30 people.

This report produced by Jillian Kitchener.