DULUTH, MN (KDAL) - Duluth Police are investigating a stabbing incident that occurred Thursday night in the 1000 block of East 3rd Street. Two men, who knew each other, were involved in an altercation that resulted in one of the men being stabbed in chest. A 39 year old man was treated at a hospital for a significant but non life threatening stab wound. The suspect had fled the scene prior to the arrival of police officers. The incident remains under investigation.