LOS ANGELES - A fire that erupted at the largest oil refinery on the West Coast threatened storage tanks while sending huge flames into the sky and black smoke across California neighborhoods before crews quickly smothered it.

Dozens of firefighters responded late Tuesday to the 1,000-acre Chevron El Segundo Refinery just south of Los Angeles, which processes nearly 275,000 barrels of crude oil a day.

Nearby residents were urged to close windows and stay inside. Streets were briefly closed, but no evacuations were ordered and no injuries were reported.

Crews using firefighting foam kept the blaze from spreading to storage tanks. Within a half-hour, few flames were visible.

The fire did not burn near any of the facility's main processing units and was confined to a distribution manifold along the facility's southwestern perimeter, Chevron spokesman Braden Reddall said in a statement. The cause was under investigation, he said.

"At this point, Chevron does not expect this incident to have an impact on its ability to supply petroleum products to its customers in the region," the statement said.

Petroleum industry analyst Patrick DeHaan said initial information indicates the fire was unlikely to affect gas prices.