I just got done reading an article from one of the most reknown crime researchers in the world from Yale University. I was shocked at some of the data he referenced in his article and had to pass this on.
In regards to Mass Shootings and the number of them and the frequency, the US ranks 11th in the world in the number of mass shootings and 12th in frequency. Behind Norway, Switzerland, France, Finland Belgium and several other EU countries.
and the US isn't even in the top half of countries in terms of the overall Homicide rate nor in the top half for countries in firearm connected deaths or injuries. Again, most of the EU is higher than the US.
Per Dr. John Lott, Professor and crime researcher, Yale University.
Comparing murder rates and gun ownership across countries - Crime Prevention Research Center
UPDATED: Comparing Death Rates from Mass Public Shootings and Mass Public Violence in the US and Europe - Crime Prevention Research Center