How the AP, USA TODAY and Northeastern built a database of mass killings that tracks more than shootings

Public mass shootings — ones that unfold in elementary schools, supermarkets and parades — tend to receive the most media attention but a new database compiled by The Associated Press, USA TODAY and Northeastern University reveals mass killings are far more likely to take place in private homes than in public spaces.

“A guy who kills his wife and children and sometimes kills himself is the most common type of mass killing,” said James Fox, a professor of criminology, law and public policy at Northeastern University who worked on the database.

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