From BBC News.

A gunman who killed four people when he stormed a skyscraper in New York on Monday evening left a note that appeared to blame the National Football League (NFL) for a brain injury, the city’s Mayor Eric Adams said.

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.

The gunman was carrying a note in which he blamed CTE, a brain disease triggered by head trauma, for his mental illness, Adams said.

Ex-teammates have told US media Tamura played football as a teenager but did not play in the NFL.

New York City police officer Didarul Islam, 36 – who was working as a security guard at the building – was among those killed.

Another of the victims was an employee of finance giant Blackstone, who was named by her company as Wesley LePatner.

Two male civilians were also killed. An NFL employee was also "seriously injured" in the attack, the league’s commissioner Roger Goodell wrote in a message to staff.

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