The shooting is being investigated by St. Louis County police. They need to found why the two kids were alone at home and why the 11 year boy had access to a handgun. As the police said, his mother is cooperating with investigators. The 11-year-old boy and the 4-year-old girl were not injured in this incident .A woman told the police however that the 16-year-old didn’t enter the house. “He was always was just sitting right there on the porch,” she said. It is the third deadly incident involving children and guns in that section of St. Louis in recent weeks.