Chevron's 285,000-barrel-per-day El Segundo refinery in southern California had taken multiple units offline on Friday after a large fire erupted in a jet fuel production unit, disrupting supply in the Golden State's isolated energy market.

The El Segundo refinery is the second largest in California and Chevron's second-biggest refinery in the United States. The facility supplies a fifth of all motor vehicle fuels and 40% of the jet fuel consumed in southern California.

The fire at the facility's jet fuel production unit broke out on Thursday evening. No injuries were reported, and all workers at the refinery were accounted for, Chevron spokesperson Allison Cook said in an email.

Chevron on Friday said the fire had been put out.

It was not immediately clear what caused the explosion at the facility in the suburb of El Segundo, which supplies jet fuel for Los Angeles International Airport (LAX), located just north of the refinery.

"There is no known impact to LAX at this time," Los Angeles Mayor Karen Bass said.

LAX declined to comment.

The fire broke out in the refinery's Isomax 7 unit, which converts mid-distillate fuel oil into jet fuel, two sources said.

On Thursday evening, multiple units at the refinery were shut, including the 60,000 barrel per day (bpd) catalytic reformer, 45,000 bpd hydrocracker, and 73,000 bpd fluid catalytic cracker, according to consultancy Wood Mackenzie.

The refinery's crude distillation units were still online, two traders said, citing Wood Mackenzie data.