The 16-year-old boy who shot two of his fellow students at Evergreen High School in Colorado on Sept. 10 appeared to hint at his plans on social media just hours before the shooting took place, according to research from the Anti-Defamation League

The anti-hate and anti-extremism organization's Center for Extremism said the teen was also active on a violent gore forum website that has been tied to at least two other school shooting suspects.

Authorities in Colorado said last week that investigators believed the teen had been "radicalized by some extremist network," but did not offer specific details.

RELATED STORY | Authorities say 'radicalized' 16-year-old boy shot students at Colorado high school with revolver

During the school's lunch hour, the teen fired a revolver handgun that he

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