Thought this was interesting
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I can't speak to all of those countries, but I know the UK and Germany at least count theirs differently than ours.
I think Germany only counts it when there is a death of a student.
and I think the UK only counts it when its a student shooting a student, teacher, or other school staff member. IIRC, strangely it doesn't work the other way. Like I think a staff member shooting a kid didn't count, even if it was at school. There was some weird exception they took, that might not be correct but its how I recall reading about it.
Found a website that says France, Germany, Greece, Hungary, and the Czechs have all had a school shooting this year. so this graphic is at least somewhat questionable.
worldpopulationreview.com
Italy also claims to have 0 school shootings since the 60s, but when you dig into they have had multiple students shot on school campuses, so I am not really sure how they are counting these things. Granted the last one was 2009, so its been a minute.
Austria had a pretty bloody 2020, which included a mass shooting event which did include someone being shot on a school campus. due to their privacy laws they don't go more into it, so I am not sure if it was a student there. but here in America that would count regardless.
Poland had a shooting at a school in 2019, not sure why they aren't on the list.