That's according to Maine State Fire Marhshal who investigated the blaze.
Fire crews were called to the home on Lakeview Drive around 11:30 a.m. Monday. Investigators determined someone set combustibles on fire inside the living room.
One of the owners was home at the time.
According to the Morning Sentinel, officials haven't made any arrests, but they have a person of interest in the case.
Officials said there was also a fire in the same home in June when a fire was started in a bathroom.