PHILADELPHIA (CBS) – At approximately 12:00 p.m. firefighters responded to a hazmat situation at a South Philadelphia refinery.

Officials say the Philadelphia Energy Solutions Refining Complex was experiencing an operational upset, which caused the fire. They believe a processing unit inside the refinery was overheating.

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The incident happened on the 2600 block of Penrose Avenue.

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The fire was out by 12:30 p.m.

No injuries have been reported.

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