CHICAGO (AP) — The fatal shooting of a 15-year-old boy slain while delivering newspapers with his stepfather to earn money to buy presents may have been the result of mistaken identity and rooted in an ongoing gang war that didn't involve him, Chicago police said Monday during a news conference in a city where gun violence this year has left nearly 600 people dead. Anthony Riccio, chief of the bureau of organized crime, said police are looking for two male suspects — the driver of a white van that rammed the car driven by Brian Jasso's stepfather and another who opened fire from the passenger window and shot the teen in the head. Riccio said witnesses of the shooting shortly before 7 a.m.