Mass shootings like the ones that have occurred in recent years in Newtown, Conn., and Aurora, Colo., have tripled in recent years, according to a study set to be published next week for the FBI.

Researchers looked at active shootings in public settings where the primary motive appeared to be mass murder and at least one victim was unrelated to the shooter, according to Yahoo News, which obtained the report.

The study, to be published next week in the “FBI Law Enforcement Bulletin,” a training publication for those in the criminal justice profession, was written by the Advanced Law Enforcement Rapid Response Training (ALERRT) Center at Texas State University.

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