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Image courtesy of Bill Barrett Corp

An explosion at an oil and gas well Monday night in Colorado injured two workers, shook houses and started a fire that lit the sky for miles.

The explosion at the  Bill Barrett Corp. drilling site north of Greely may have been caused by static electricity or a nearby vehicle, fire officials have said.

The two men sustained burn injuries.

They were taken by ambulance to the North Colorado Medical Center in Greeley.

Hospital spokesperson Gene Haffner said the workers were in fair condition.

The explosion happened at about 11:20 p.m. Monday.

Greeley is in Weld County, 49 miles north-northeast of Denver.

“We were getting ready for bed, and the whole house shook,” said Liz Hegert, a resident in the area, told the Greeley Tribune.

No residents were reported injured, Eaton Fire Protection District Chief Hugh Kane said.

“When we arrived, there was heavy smoke and flames coming out of the storage containers,” Kane said.

One report said oil may have accumulated on top of water in a temporary tank. The exposed oil and its vapors could be what ignited.

The well will reportedly be shut-in while an investigation is conducted.