GREENVILLE — A compressor at a natural gas well in northwestern Pennsylvania caught fire this morning and burned for about three hours, prompting at least one nearby home to be evacuated.

Mercer County officials say nobody was hurt in the fire at the well operated by Bocor Holdings. A production manager for that company said the well draws gas from the Clinton formation nearly a mile below the surface, but says he could say little about the fire that was reported about 4 a.m.

The well is in Greene Township, Mercer County.

A 911 dispatcher said the fire was extinguished about 6:45 a.m.

It was not immediately clear what caused the fire.