Officers responded to a Zoomers gas station on Broad Street in Elizabethton around 12:30 Wednesday afternoon.
Elizabethton Fire Marshall Jack Buckles tells us flames were visible when they arrived.
We're told the call came in when work was being done in the ceiling area of the gas station.
"The fire was traveling in the void between the attic and the roof, between the ceiling and the roof. We are still early in the investigation to determine the cause," said Jack Buckles.
We're told no one was injured in the fire.