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 its headquarters but took the wrong elevator, officials said Tuesday.

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

Tamura, 27, sprayed the skyscraper's lobby with bullets then shot another person in a 33rd-floor office on Monday before he killed himself, authorities said. Among the dead were a police officer, a security guard and two people who worked at companies in the building. An NFL employee wa

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