Suspect in Buffalo Mass Shooting Was Previously Investigated By Police

Authorities say the 18-year-old made a threat at his high school last June. School officials alerted police, resulting in a mental health evaluation, but was released shortly after. Investigators now examining a 180-page “manifesto” posted by the alleged shooter on Thursday. In it, he refers to himself as a White supremacist and repeatedly referenced the mass shooter who killed 51 people at a New Zealand mosque. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews

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Suspect in Buffalo Mass Shooting Was Previously Investigated By Police