Chevron’s El Segundo refinery near Los Angeles was hit by a massive fire in its jet fuel production unit on Thursday, with flames and smoke billowing into the sky and fuelling worries about supply disruptions in California’s isolated energy market.

No injuries were reported and all workers at the refinery were accounted for, Chevron spokesperson Allison Cook said in an email. Media said the blaze had been contained, though it was still burning early on Friday.

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).

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

It was unclear how it would affect

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