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

Many mass killings receive relatively little news coverage in the U.S. – “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. But “although it is relatively easy to acquire information about the most high profile cases given the amount of press coverage, press briefings by law enforcement, and sometimes even reports from ad hoc investigations, most mass killings receive rather little coverage.” The newly public Mass Killings Database is one of the most comprehensive datasets assembled on the topic. It tracks all U.S. homicides since 2006 where four or more people — not including the offender – were killed. Each incident has dozens of data fields including location and detailed information about the offender (name, age, race, sex, and any previous criminal record), victims (including cause of death and relationship to the assailant), and weapon (including, if applicable, gun type, model, manufacturer, and caliber). The collaborative project has been underway since 2018 and revives an earlier iteration of the database launched by USA Today in 2012.”

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