Sullivan County fire crews are investigating an early morning house fire.

Dispatchers tell us they got the call just after 1:45 Monday morning to a mobile home on Old Blair's Gap Road.  News 5 has learned, no one was in the house at the time of that fire.

Crews remained on the scene for several hours, to get out the flames.

There's no word yet on where that fire started in the home or on a possible cause.