The Story Behind the Data on Mass Murder in the United States

News coverage in the days following the mass shootings in El Paso, Texas, and Dayton, Ohio, relied upon a common source for context: The AP/USATODAY/Northeastern University Mass Killing database. That’s because it’s the most comprehensive, most up-to-date repository of information on U.S. mass killings, says James Alan Fox, who is a criminologist at Northeastern University and one of the nation’s leading researchers on mass murder.

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