An explosion and fire at California's second-largest oil refinery raised concerns about a potential rise in the state's already high fuel prices, but by how much and when remains to be seen as authorities determine the extent of the damage at the expansive property in El Segundo.

Firefighters were still pouring water on the fire Friday morning, hours after residents said they felt a rumble from an explosion before flames cast an eerie orange glow over homes in the coastal South Bay community south of Los Angeles International Airport. The fire, which Chevron said began at a processing unit near the southeast corner of the refinery, was out later Friday morning, the company said, but damage was still being assessed.

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