SAGINAW -- Saginaw police continue to investigate a shooting that left a 12-year-old boy critically injured Saturday.  Officers responded to 12^th and Hartsuff streets around 4:20 p.m.  They found a boy had been shot in the stomach.  He was taken to a local hospital with life-threatening injuries.  Detectives are interviewing witnesses and investigating the incident.  Anyone with information should call Sgt. Joseph Dutoi at (989) 759-1248.