ExxonMobil and ConocoPhillips said that their refineries in Billings, Mont., aren't the source of an oil sheen observed last week in the Yellowstone River. ExxonMobil spokeswoman Rachael Moore said that an oil sheen was seen in the Yellowstone River, upstream of the refinery, on Friday. The company deployed a spill-response team to clean up the oil, she added.

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