DENVER (KDVR) — The Federal Bureau of Investigation says that in the months leading up to the shooting at Evergreen High School, the agency had been looking into a social media account that discussed planning a mass shooting.
On Monday, FOX31 asked the FBI if it had received a tip this summer related to the shooter. In a response, the agency said it had been looking into an account that shared non-specific threats about planning a mass shooting. The agency said it had not identified the person behind the account as of the day of the Evergreen shooting.
"In July 2025, the FBI opened an assessment into a social media account user whose identity was unknown and who was discussing the planning of a mass shooting with threats non-specific in nature," the agency said.
On Sept. 10, a 16-year-old student shot two other students and himself at the school. The shooter died of a self-inflicted gunshot wound at a hospital that evening, and one of the two victims has since been identified.
On Friday, the Anti-Defamation League released a report showing what it says was online activity from the shooter. The organization found that he had posted tributes to other mass shooters, including a homemade t-shirt replicating one worn by one of the Columbine High School shooters.
The FBI said its work looking into the social media account that had posted threats continued up until the day of the shooting.
"We continued to work this assessment investigation to identify the name and location of the user up and until September 10, 2025. During the assessment investigation, the identity of the account user remained unknown, and thus there was no probable cause for arrest or additional law enforcement action at the federal level," the FBI told FOX31.
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The Jefferson County Sheriff's Office said during a press conference last week that the shooter was "radicalized through an extremist network" and would share further details about that later.
"There's some level of confirmation that there's something we really need to take a deeper look at," the spokesperson said.
The Anti-Defamation League said that immersion in graphically violent online communities can desensitize young people to violent acts.
---Find mental health resources in Colorado.If you are thinking of hurting or killing yourself:Call or text 988 or chat at 988lifeline.org.Please get help immediately.
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