The Frontier Oil Refinery here in Cheyenne remains in operation despite a fire in a crude oil processing unit.

Frontier Refining spokesman Mel Wilkenfeld says the fire broke out about 5:40 a.m. Wednesday within a unit where the processing of crude oil into gasoline begins.  Cheyenne Deputy Fire Chief John Fox says an oil line may be at the root of the cause…(Click to hear comment from Deputy Chief Fox)

No one was hurt.

Fox says the fire was put out within an hour and there were no harmful releases from the refinery. Refinery officials are still assessing the damage done to the unit itself which has been shut down.

Wilkenfeld says no major equipment was damaged in the fire so operations at the refinery continue.

The refinery can process up to 52,000 barrels of crude a day.