Chattanooga fire investigators believe a late-night blaze at a house on East Avenue was intentionally set.
At 11:35 p.m.,firefighters were dispatched to a home in the 700 block on a reported residential structure fire.
Someone driving by the house spotted it and called 911 to alert emergency personnel.
Upon arrival on the scene, crews noticed light smoke coming from the roof of the house, which was vacant and had been condemned.
Flames were discovered on the second story and were contained to the upstairs rooms. Firefighters then conducted fire suppression operations and ventilated the structure.
Investigators concluded that the fire started in the bathroom of the second floor as a result of arson.
The home had no power or utilities.
The case remains under investigation.
East Avenue is in Woodmore in the vicinity of Shallowford Road.