The Danville Fire Department responded to a structure fire at 1112 Abbott St this morning at 04:55 am. Upon arrival units reported fire showing through the roof on the left rear of the single family dwelling. Crews made entry to the structure searching for any possible victims while additional crews attacked the fire. Search crews were able to determine that the structure was unoccupied at the time of the fire. Damage to the structure was significant. The fire has been ruled to be arson and is being investigated by the Fire Marshall's office. There were no reported injuries. The Danville Fire Department responded with three engines, one ladder truck a safety officer and a chief officer. The Danville Police Department and the Life Saving Crew responded for assistance.