Janesvlle fire officials are investigating the cause of a blaze at the American Farm Implement Dealer over the weekend. When firefighters arrived at 122 South River Street a little after 7:00 o'clock Saturday morning they found the second floor filling with smoke. The smoke was coming from a fire in the elevator cargo box floor and wall. After extinguishing the fire, the department helped ventilate the building. The fire caused $5000 damage.