A teen who opened fire in a Colorado high school this week was active on a so-called "violent gore" site months before the attack, the Anti-Defamation League said in a report released Friday.

Colorado officials said Desmond Holly, 16, who died of a self-inflicted gunshot after injuring two students at Evergreen High School, had been "radicalized by an extremist network," but did not provide further details.

According to the ADL report, several school shooters in the past year, including Holly, had been active on the same website, which the organization says is known for hosting content backing white supremacist ideas as well as material portraying graphic violence against both people and animals. People can navigate to the website, WatchPeopleDie, and access a forum where they ca

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