A 9:30 p.m. Thursday Explosion in a Processing Unit Set Off the Blaze

Flames at Chevron’s El Segundo refinery were extinguished overnight after an explosion ignited a processing unit near the facility’s southeast corner around 9:30 p.m. Thursday, officials said. Chevron initiated an internal investigation into the cause, as city fire crews from El Segundo and Manhattan Beach supported the refinery’s on-site responders, which it announced in an alert .

All employees and contractors were accounted for, and no injuries were reported. Chevron said its Health, Safety, and Environmental team conducted mobile air monitoring in surrounding neighborhoods as a precaution. State and regional regulators, including Cal/OSHA, the California Office of Spill Prevention and Response, and the South Co

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