A massive fire was burning at a Chevron refinery on Thursday, sending large flames and a dark plume of smoke up into the air in El Segundo, Los Angeles.

The fire erupted around 9:30 p.m. at the refinery in the 300 block of West El Segundo Boulevard, the El Segundo Police Department said.

While the exact reason for the fire is still unclear, the fire is believed to have originated from an isolation unit in the refinery, according to LA County Supervisor Holly Mitchell.

“We have zero reported injuries and all workers and contractors are accounted for,” said El Segundo Mayor Chris Pimentel. “We rehearse these things in conjunction with Chevron all the time. We do a full sweep of disaster preparedness drills. Everything from spills in the ocean to fires at the refinery.”

Neighbors tell NBC

See Full Page