BURLINGTON, Vt. (WCAX) – Burlington police are investigating an incident that happened overnight that reportedly ended in gunfire. Police say after speaking with witnesses, they learned a fight had broken out involving multiple people. They said a person had fired a handgun into the air, breaking up the fight. The BPD Detective Services Bureau is investigating the incident. They ask for anyone with any information to call Detective Sergeant Phil Tremblay at (802) 540-2323.