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The interactive map below and our downloadable database have been expanded with 22 additional cases from 2013-2016.
Dating from 2005, the FBI and leading criminologists essentially defined a mass shooting as an attack in a public place in which four or more victims were killed.
For much more of our reporting on mass shootings, gun violence, and gun laws, see our special investigations: America Under the Gun, Newtown: One Year After, and The True Cost of Gun Violence. While those larger datasets of multiple-victim shootings may be useful for studying the broader problem of gun violence, our investigation provides an in-depth look at the distinct phenomenon of mass shootings—from the firearms used to mental health factors and the growing copycat problem.Tracking mass shootings is complex; we believe ours is the most useful approach.A recent analysis of this database by researchers at Harvard University, further corroborated by a recent FBI study, determined that mass shootings have been on the rise.We've gathered detailed data on more than three decades of cases and mapped them below, including information on the attackers' profiles, the types of weapons they used, and the number of victims they injured and killed.