Investigators now say that a fire that destroyed a historic building in Sullivan Indiana earlier this week may have been arson. The fire in the two story commercial building downtown occured around 3 a.m. Monday. The Indiana State Fire Marshalls Office is asking anyone who has any information about the blaze to call the Indiana Arson Hotline at (812) 382-4628. Any tip leading to an arrest in the case could lead to an award of $5000. The building destroyed formerly housed a law office and was already partially collapsed. There were no injuries.