BUFFALO, N.Y.—A teenager who allegedly killed 10 people in a shooting at a western New York grocery store had been taken into custody last year and given a mental health evaluation after making a threat at his high school, authorities said.
New details, including the previous threat, emerged on Sunday that provided a fuller portrait of the suspect, Payton Gendron, 18, and his assault on a Buffalo supermarket that authorities described as an act of “racially motivated violent extremism.”
