Only one of them was in the United States, and that was number four of five. The rest were in countries with stricter, in some cases much stricter gun laws.
(If I owe someone a hat tip for this, sorry. It was in my tabs and I lost the source associated with it)
Reading the comments it’s extremely interesting that the #5 shooting in Bogota, Colombia was perpetrated with a revolver. Just goes to show that reloading is only a problem if you have opposition, ie if you are being attacked.
A top five mass murders list (any type of weapon) would move most of those off the list.
Interesting that two of the perps were Korean.