Thunder Bay Police are investigating an assault on an 18 year old man on the City's south side. Constable Julie Tilbury says not much is known about last night's incident. The teen was walking in the area of North Marks Street and Cumming Street. He was approached by a group of men and was assaulted by one member of the group. He was taken to hospital by ambulance and has been released. Police are looking for a man with a buzz cut hair style wearing a grey hoodie.