The attacker, 27-year-old Shane Tamura of Las Vegas, shot himself dead after opening fire in a building where the American football league has its headquarters.
New York City Mayor Eric Adams says the gunman who killed four people when he stormed a skyscraper in the heart of New York on Monday evening left a note that appeared to blame the National Football League (NFL) for a brain injury.
The attacker, 27-year-old Shane Tamura of Las Vegas, shot himself dead after opening fire in a building where the American football league has its headquarters, but went to a different part of the building after taking the wrong lift.
Mr. Adams says the gunman was carrying a note in which he blamed the CTE, a brain disease triggered by head trauma, for his mental illness.
Ex-teammates have told US media that Tamura played football as a teenager but did not play in the NFL.
A New York City police officer who was working as a security guard in the building and an employee of finance company Blackstone was among those killed.
NFL Commissioner Roger Goodall says a league employee was also seriously injured in the attack.
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