The Number of Mass Public Shootings by year since 1998, comparison to international number of such shootings over time

Here is a link to an article by John Lott that addresses mass public shootings in the US and elsewhere.

Lott shows that the US mass murder rate is not particularly high relative to the rest of the world.  He also shows how flawed can be even the FBI's statistics.

Here is an excerpt.
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The FBI’s claims about Active Shootings increasing over time are completely flawed. Below is part of the discussion of this from Dr. Lott’s The War on Guns.