WILMINGTON, Del. - Wilmington police are investigating a shooting that critically injured an 18-year-old and a 12-year-old.According to officials, police were called to 24th and Tatnall Streets Friday, around 3:45 in the afternoon, on the report of a shooting.Officers found an 18-year-old male and a 12-year-old male at a local hospital, listed in critical condition.Responding officers found another 18-year-old male with non-life threatening gunshot wounds, at the scene.