BP said its largest U.S. refinery, at Whiting, Indiana, continued to operate on Thursday morning following a blaze the night before that was expected to have a minimal impact on production.
One worker was taken to an area hospital for treatment, but was later released, the company said.
BP said operations at the 413,500 barrel per day (bpd) Whiting refinery "were minimally impacted as a result of the incident and the refinery continues to produce products for customers."
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The Whiting refinery is the seventh-largest refinery in the United States and the largest outside of the Gulf Coast.