Oil giant ExxonMobil said today its fire brigade had quickly put out a fire at its 155,000-barrel-a-day Torrance, California, refinery.
There were no injuries in the blaze, it added.
The local fire department also arrived at the plant to offer assistance.
The company did not say where in the refinery the fire broke out.
The fire did not affect the refinery’s current operations, according to the company.
Five investigators from the US Chemical Safety Board (CSB) were at the plant on Wednesday to investigate an earlier fire there on February 18.
They had just left the plant when the latest blaze occurred, according to Daniel Horowitz, a senior adviser to the CSB.
The previous fire broke out in the refinery’s petrol-producing fluid catalytic cracking unit.
Exxon is still operating the refinery at reduced rates after the previous incident.
It told analysts last week that previous incident centred on an emission controls device on a petrol-making unit.
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