The white gunman accused of committing a racist massacre at a Buffalo supermarket made threating comments that brought police to his high school last spring, but he was never charged with a crime.
Payton Gendron, 18, traveled about 200 miles from his home in Conklin, New York, to Buffalo to commit the attack, police said.
Gendron had threatened to carry out a shooting at Susquehanna Valley High School in Conklin around graduation, a law enforcement official who spoke on condition of anonymity said. The official was not authorized to speak publicly on the investigation. Those laws allow law enforcement officers, a person's family, or in some cases, medical professionals or school officials to petition courts to temporarily seize the person's firearms, or prevent them from buying guns.