The fire was reported around 12:30 a.m. Tuesday in the 200 block of Sheri Drive in Georgetown.

Investigators said a leaking gas line in the basement of the home "was found uncapped, with the valve in the open position."

Witnesses say they saw a white man in a black hoodie and dark pants go inside the house. They say the fire started shortly after he left.

The cause of the blaze remains unknown and under investigation by the Indiana State Fire Marshal.

The six fires were set in Lawrence County on March 19 near Bedford and Springville.