And while you are at that learning thing, consider improving your reading comprehension and English language skills.
I said "MOST", not "ALL"; hopefully the differences aren't too nuanced for you to grasp.
BTW - you Europeans seem to hold a record of sorts on this mass shooting/killing "business" and that in countries with strict gun controls and a largely unarmed public;
Norway police say 85 killed in island youth camp attack
The death toll from the shooting at a Norwegian youth camp rises to 85, as police question a 32-year-old suspect.
www.bbc.com
...
Fjotolf Hansen[5] (born 13 February 1979), better known by his birth name
Anders Behring Breivik (Norwegian pronunciation:
[ˈɑ̂nːəʂ ˈbêːrɪŋ ˈbræ̂ɪviːk] (
listen))
[6] and by his pseudonym
Andrew Berwick, is a Norwegian far right domestic terrorist,
[7] known for committing the
2011 Norway attacks on 22 July 2011. On that day, he killed eight people by detonating a
van bomb at
Regjeringskvartalet in
Oslo, then killed 69 participants of a
Workers' Youth League (AUF) summer camp in a
mass shooting on the island of
Utøya.
[8][9]
...
en.wikipedia.org