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Analysis of Recent Mass Shootings

Using FBI data and media reports, Everytown for Gun Safety developed an analysis of mass shootings that took place between January 2009 and July 2014. The analysis found that there have been at least 110 mass shootings in this five and a half-year period.

The FBI defines a “mass shooting” as any incident where at least four people were murdered with a gun. Below are some of the report’s more surprising findings:

  • Mass shootings represent a small share of total US firearm homicides.
  • There is a strong connection between mass shooting incidents and domestic or family violence: at least 57% of mass shootings surveyed were related to domestic or family violence.
  • Perpetrators of mass shootings are generally older than perpetrators of gun violence in the US as a whole. While the median age of known overall gun murderers in the U.S. is 26, the median age of perpetrators of mass shootings was 34.

Click here to download the full analysis, and click here to explore our interactive feature on mass shootings.

Click here to download the full data set.