NEW YORK (AP) — A gunman who killed four people inside a Manhattan office tower blamed his mental health problems on the National Football League and intended to target the league’s headquarters upstairs but took the wrong elevator, officials said Tuesday.

Investigators said Shane Tamura, a Las Vegas casino worker, was carrying a handwritten note in his wallet that claimed he suffered from chronic traumatic encephalopathy, known at CTE, and accused the league of hiding the dangers of brain injuries linked to contact sports.

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