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The NFL is headquartered in that building and the shooter was trying to send a message about football.
Police said the shooter when he was found was carrying "a manifesto" and notes about chronic traumatic encephalopathy caused by head trauma, Bloomberg News reported, citing two senior law enforcement officers.
He wrote that the NFL did not do enough to address CTE, which has been linked to cognitive, emotional, and behavioral problems in former players. The suspect had played football before a head injury ended his career, Bloomberg reported.