A 16-year-old boy was killed and two other teens were shot and wounded when gunfire rang out in the Bronx Wednesday night during a massive street fight, cops and witnesses said. Cops rushed to the busy intersection of Broadway and West 238th Street in Kingsbridge around 5:10 p.m., where they found the 16-year-old shot in the back and two other teens — a 15-year-old boy and a 13-year-old girl — both suffering from gunshot wounds to the right leg, police said. All three were taken to St. Barnabas Hospital, where the older victim was pronounced dead.