A 20-year-old Milwaukee man was injured in a late night shooting in West Allis on Sunday.  According to the West Allis Police Department, around 10:30 p.m., there were reports of gun shots in the area of S. 56th Street and W. Greenfield Avenue.  When Police investigated, they found a man with a gunshot wound, seated in his vehicle.  He was transported to a local hospital for treatment.  Officers and detectives are investigating the circumstances surrounding the shooting, but at this time, according to police, there are no other known victims and no one is in custody.