Vermont police are investigating after one person was injured by the explosion of what's described as a "small homemade destructive device."
Brattleboro police say there is no known concern for the safety of the public.
Police and rescue crews were called to a spot near a bridge on Elm Street early Monday.
One person, whose name was not released, was injured in the explosion. He was taken to a local hospital with non-life-threatening injuries. He was treated and released.
The investigation found that the device was detonated under the bridge.
No damage was reported to any nearby structures.
The investigation is continuing.