SUPPLEMENTARY INFORMATION - Nature

Mass Shootings In a similar manner to gang violence, mass-killings (≥ 3 deaths per event) comprise a relativelysmall number of events (6.3%, 24 events) in contrast to what may be suspected from press reports. In fact, the vast majority of events (> 85%) have one death or less—resulting in anaverage of 1 death per event across the entire dataset (Supplementary Figure 3). ................
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