An intentionally set fire is being investigated by State Police.  Troop A was notified shortly before 6pm Tuesday that there was a fully involved fire at an abandoned building on the Southbury Training School property on Village Road.   A school employee saw the glow of the fire and called 911.  The Fire and Explosion Investigative Unit responded and determined that the blaze was intentionally set.  The Fire Marshal’s unit is investigating the cause and looking for anyone with information.  The Connecticut Arson Tip Award Program is offering a reward of up to 25-hundred dollars for information leading the arrest, conviction or prevention of arson fire.  The Arson Hotline is 1-800-8-4-ARSON.