Vincennes fire officials have ruled a vacant structure fire this past Sunday as arson. Firefighters were called out about 11:45 a.m. Eastern Time to 929 Broadway and arrived to find heavy smoke and flames. Two firemen were injured in fighting the blaze. After investigation the fire was determined to be intentionally set. Anyone with information about the fire can contact the Indiana Arson Tip Line or the Vincennes Fire Department. There is a $5000 reward being offered for information leading to an arrest.