A house fire in Evansville is ruled arson-- but investigators are still trying to figure out how the blaze began--- and who set it. It started on the front porch at 1314 South Linwood Avenue. Fire fighters arrived just before midnight-- and found the fire had already spread to the two surrounding homes. Officials say all three houses are abandoned, and in poor condition. Neighbors complained of fireworks being shot off in the area, but investigators do not believe thats what sparked the fire.