we begin tonight with that school shooting averted. this evening authorities say a man was tackled. he had a gun. it happened in park rose high school in portland, oregon. police responding to a call, an armed man on campus. a football coach confronting the suspect, tackling him to the ground. tonight the evacuation and authorities on the scene. abc s will carr leading us off. reporter: tonight another potential school shooting averted, after a heroic football coach tackled an armed gunman at a portland school. there s a male here with a shotgun, and i can smell what smells like a blast here at some point. reporter: portland police received the emergency call just before noon. i need rifle operators to start heading towards parkrose. reporter: that s when a witness says keanon lowe, a coach and former university of oregon football player, sprang to action after he noticed the suspect with a shotgun. lowe wrestled him to the ground then held he gunman until police arrived. t