A dispute between groups of teenagers on a New York City subway train spiraled into a spray of bullets Sunday, leaving one young man dead and three others hospitalized, police said. A single young gunman shot the four - in front of other passengers - between stops on a northbound No. 5 train in the Bronx shortly after 2:30 am, police said. One victim died at the scene; the three survivors were in stable condition later Sunday at Our Lady of Mercy Medical Center, police said. A 19-year-old was treated for a gunshot wound to the abdomen, and an 18-year-old shot in forearm was also treated at the medical center. Both were released to Jacobi Medical Center, said hospital spokesman Fred Yaeger. Another 18-year-old shot in the finger was treated and released to officials for questioning. The gunman apparently slipped off the train at a stop following the shootings. Police have not made any arrests.