Barre police say a $20,000 reward is being offered for help finding the person or people responsible for a string of four arson fires reported in the Vermont city in the last month.
Barre police, fire and emergency medical services and the state police fire investigation unit are investigating the fires.
The first of the four fires was reported Aug. 3, another on Aug. 7 ad the third on Aug. 18.
The most recent fire was Monday when an arson fire did $200,000 damage to a building that housed a former bed and breakfast.
All the buildings were either vacant or used for storage.
No injuries have been reported.