A 14-year-old boy accused of killing four people at Apalachee High School in Winder, Georgia, was previously questioned by police about anonymous online threats, according to the FBI. Colt Gray, the suspect, denied responsibility in May 2023 for internet posts that featured images of guns and warned of a potential school shooting.

On Wednesday, Gray allegedly opened fire at the high school, killing two teachers, Christina Irimie and Richard Aspinwall, and two students, Mason Schermerhorn and Christian Angulo, both aged 14. Eight other students and one teacher were injured in the attack. Gray was arrested on campus and is set to be prosecuted as an adult.

Georgia Bureau of Investigation Director Chris Hosey reported that the gun used in the shooting was an “AR-platform style weapon.” The FBI’s National Threat Operations Center revealed that they had alerted local law enforcement in May 2023 after receiving anonymous tips about online threats to carry out a school shooting at an unspecified location and time. Investigators quickly traced the threats to Georgia within 24 hours.