Stuttgart-After an argument in a parking lot in Niedernhall in the German state of Baden-Württemberg, an 18-year-old is said to have followed, hit and fatally injured a twelve-year-old boy. He was arrested on Thursday evening after the crime, the police said on Friday. In the presence of his friend two years younger, the 18-year-old got into a fight in the parking lot with the twelve-year-old victim and his 13-year-old companion.