As far as I'm unaware of that is has at a school, but it has happened in a larger scope. If schools are some how sacred and get their own little bracket in relation to violence I'm also unaware of it as well. The fact is be it a shcool, mall, festival outing, club, stadium, church, federal building. People have, will and can perpetrate mass killing with various tools. The fact people are willing to cherry pick that to fit their narrative is concerning, as if we just focus on the schools and only worry about the other areas when they come up or just ignore them to argue this one place...
Not how the world works, and probably why
@Northstar brought it up the way he did.