Investigators plan to question a man who supplied parts for a gun used in the shooting at a Manhattan office building that houses the National Football League’s headquarters, New York City Police Commissioner Jessica Tisch said Tuesday.

The man tried to target the on Monday but took the wrong elevator, Mayor Eric Adams said. The shooter including a New York City police officer and wounded a fifth before taking his own life, authorities said. A note found on his body suggested he had a grievance against the NFL over an unsubstantiated claim that he suffered from chronic traumatic encephalopathy, a brain disease linked to head trauma.

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