This was not yet confirmed by Shell.
A fire broke out near a catalytic cracker to make gasoline and it was brought under control about a hour later, a Rotterdam police spokesman said.
A Shell spokesman said the fire broke out at around 1220 GMT at a pipeline. Nobody was injured.
Pernis has a capacity to process 412,000 barrels of crude oil a day. (Reporting by Ikuko Kao and Niclas Mika)
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