The FBI received information about a suspect in a shooting at a Georgia high school last year.

A teenager suspected of opening fire at his Georgia high school early Wednesday morning, killing four people, was questioned by law enforcement last year after the FBI received anonymous tips about online threats to shoot up the school, the agency’s Atlanta field office said.

The threats, which did not specify details such as location and time, included images of a gun, the field office said in a news release. “Within 24 hours, the FBI determined that the online post originated in Georgia, and the FBI Atlanta Field Office forwarded the information to the Jackson County Sheriff’s Office for action,” the release said.

The sheriff’s office located a possible suspect, a teenager who was 13 at the time, and interviewed him and his father. The father told investigators he kept a hunting gun at home, but his son didn’t have free access to it.

The 13-year-old denied making the threats. The sheriff’s office notified local school administrators “to continue to monitor the individual,” according to the release, but no further action was taken.

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The boy, now 14, was previously identified as Colt Gray, the alleged shooter behind Wednesday’s attack at Apalachee High School. He is believed to have used an AR-style weapon, but investigators are still investigating how he brought the firearm onto school grounds.

According to Georgia Bureau of Investigation Director Chris Hosey, he “immediately surrendered” to two school resource officers who confronted him, and he was arrested.

During an evening news conference, Hosey identified the dead as students Mason Schermerhorn and Christian Angulo, both 14, and teachers Richard Aspinwall and Christina Irimie.

Another nine people — eight teachers and one student — were hospitalized with various injuries, although Barrow County Sheriff Jud Smith said he did not expect any more deaths. “All of our victims that are in the hospital are expected to survive and recover, we’re told,” he said.

A North Georgia Medical Center spokesman told NBC News that eight patients were taken to three hospitals in its system, including three with gunshot wounds. Five people came in with symptoms of panic attacks, the spokesman said.

Hosey said Gray is believed to have acted alone and that there was no remaining threat to the school or the district. A possible motive for Wednesday’s incident, the deadliest school shooting in state history, was not immediately released by law enforcement.

“We are still trying to piece together many of the details about the time that elapsed from the time he came to school today until the incident,” the principal added.

Classmate Lyela Sayarat told CNN that Gray left their classroom at the beginning of Algebra 1 that morning. He returned at the end of the period, knocking on the door.

14-year-old school shooter kills four, wounds nine

Sayarath said another student got up to let him in but noticed the gun and stopped. Gray went to a neighboring house and opened fire, she said.

Gray, who will be arrested Wednesday evening, will likely be charged with murder and tried as an adult.

“Throughout the day, FBI personnel have been cooperating and supporting local and state law enforcement,” the Atlanta field office said in a statement. “The FBI will devote all available resources, as requested, to pursuing justice and closure for the victims and their families.”

At an earlier news conference, Sheriff Smith vowed that the “evil” that befell the community that day would not triumph.

“Hate will not win in this county,” he said. “I want to make that clear and known. Love will win over what happened today. I assure you of that.”

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