(Reuters) - ExxonMobil said it found two separate spots of oil beyond 20 miles from the point of release from its ruptured Montana oil pipeline, but there was no oil between 20-40 miles from the site of the release.
One spot of oil was located about 40 miles from the site of the release and the second spot was about 80 miles away, the company's unit ExxonMobil Pipeline Co said in a statement.
Earlier, the company had said that the spill appeared to be concentrated within a 15-mile stretch of the Yellowstone River between Billings and the nearby town of Laurel.
However, Tim Thennis, Montana Disaster and Emergency Services duty officer, had said he had received reports of oil near the community of Hysham, about 75 miles downstream from Billings.
On Thursday ExxonMobil Pipeline also said that air quality monitoring confirmed that there was no danger to public health.
On Sunday, ExxonMobil said a pipeline operated by the company leaked up to 1,000 barrels of crude oil into the Yellowstone River in Montana.
The spill came just weeks after the company shut down the pipeline in May after the city of Laurel had safety concerns due to the rising levels of the river from rain and runoff.
(Reporting by Mihir Dalal in Bangalore; Editing by Richard Chang)