A teenager accused of shooting students at a suburban Denver high school appeared to develop a "deep fascination" with mass shootings and shared neo-Nazi views online months before the attack, research by the Anti-Defamation League found.

Authorities said Desmond Holly , 16, died from self-inflicted injuries on Sept. 10 after he fired a handgun inside and outside Evergreen High School in Jefferson County, Colorado. The shooting, which left two students critically injured, forced the school into a brief lockdown and prompted a massive police response.

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