BUFFALO, N.Y. (AP) — The 18-year-old gunman who authorities say killed 10 people at a Buffalo supermarket had previously threatened a shooting at his high school and was sent for mental health treatment.

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A law enforcement official told The Associated Press that Payton Gendron had appeared on the radar of police last year after he threatened to carry out a shooting at Susquehanna High School around the time of graduation.

New York State Police said troopers were called to the Conklin school on June 8, 2021, for a report that a 17-year-old student had made threatening statements.

Police said the student was taken into custody under a state mental health law and taken to a hospital for an evaluation.