The anonymous tips were sent to the F.B.I. last May from as far away as Australia, warning that a user on Discord, a social media platform, had threatened in a chat group to possibly “shoot up a middle school.” The authorities were led to a 13-year-old living in Jackson County, Ga.
A report from the Jackson County sheriff’s office, obtained by The New York Times, detailed how investigators looked into but were unable to definitively link those threats to the teen, who is now in custody after a shooting on Wednesday morning at his high school in Winder, Ga. He is accused of killing two students and two teachers.
Hours after the shooting, the F.B.I. disclosed that law enforcement had investigated the online threat, which was made in May 2023. But the report from the sheriff’s office reveals more about how the authorities were able to trace the post to the teenager, and why — after interviewing the boy and his father — they did not take further action, other than a warning to his middle school.
According to the report, the F.B.I. received several tips from users with internet addresses in Palmdale, Calif., Los Angeles and Cockburn, a city in Western Australia, which included the posts made in a group chat on Discord. The email associated with the account belonged to Colt Gray, the teen accused of the shooting at his school.
The investigators found that the username on the Discord account had been written in Russian. “Translation of the Russian letters spells out the name Lanza,” the investigator wrote in his report, noting that it was the surname of the perpetrator of the 2012 massacre at Sandy Hook Elementary School in Newtown, Conn., in which 20 students and six teachers were killed.
In interviews with investigators, both Mr. Gray and his father, Colin Gray, said that they did not speak Russian, and the boy denied that he had been the author of the threats. He said that he had previously had a Discord account, but had deleted it, claiming he had been repeatedly hacked and was “afraid someone would use his information for nefarious purposes,” an investigator wrote.
The teenager told an investigator “he would never say such a thing, even in a joking manner,” according to the report. During the interview, an investigator noted that the boy was calm and had a reserved demeanor.
His father told an investigator that he and his wife were divorced and had been evicted from their home. His wife took their younger two children, he said, and he and his son had moved into a new home.
The father also told an investigator that his son had experienced “some problems at West Jackson Middle School and now that he was going to Jefferson Middle School it was a lot better.”
Colin Gray also told investigators that he had hunting rifles in the house, but that his son did not have “unfettered” access to them.
Sheriff Janis G. Mangum of Jackson County said on Thursday morning that her office had notified Jefferson Middle School, where Mr. Gray had been enrolled, but classes had already ended for the school year. This year, Mr. Gray had just started as a freshman at Apalachee High School in Winder, which is in neighboring Barrow County.
After interviewing the father and son on May 20, 2023, the investigators determined that they had exhausted their efforts.
“Due to the inconsistent nature of the information received by the FBI,” an investigator wrote, “the allegation that Colt or Colin is the user behind the Discord account that made the threat cannot be substantiated.”
Sheriff Mangum said in an interview on Thursday that she was anguished about the violence at Apalachee High School, but also said that her office had investigated last year’s threat thoroughly and taken the inquiry as far it could.
“It’s not like we didn’t investigate it,” she said. “It’s not just that we didn’t do anything.”
She added: “I’m broken to think about what happened yesterday. That could have been any school. There’s other schools where this has happened. There’s evil in our society.”
