Abigail Zwerner has announced she is suing school administrators, claiming they were warned three times that the student had a gun before she was shot by the student inside a classroom. WATCH FULL EPISODES OF WORLD NEWS TONIGHT: https://abc.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://bit.ly/3iQLwPp #worldnewstonight #abcnews #shootings #teachers #guns #schoolshooting