The 17-year-old boy who went on a shooting spree at a school in Iowa on Thursday allegedly took the extreme step because he was "tired of being bullied".
Dylan Butler killed one person and injured five, including the school principal, before taking his own life with a gun. The police believe that Butler planned to kill more people as an improvised explosive device was also found on his body. He opened fire on the Perry High School campus with a handgun and a shotgun on Thursday.
