A gunman who killed four people in a New York office block was trying to target the NFL headquarters but took the wrong lift, the city’s mayor has said.

Eric Adams said it’s believed he was trying to get to the NFL (National Football League) offices after shooting several people in the lobby.

Shane Tamura, from Las Vegas, accidentally entered the wrong set of lifts, the mayor said.

“We have reason to believe that he was focused on the NFL agency that was located in the building,” Mr Adams told MSNBC.

A police officer, Didarul Islam, was among those killed on Monday. The 36-year-old was married with two children, and his wife was pregnant.

Sky’s partner network, NBC News, said a note was found in which the suspect expressed anger at his mental illness potentially being linked to him having played American football.

Tamura played high school football but was never in the NFL.

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New York‘s police commissioner said on Monday that the gunman had a “documented mental health history”.

The shooting happened at 345 Park Avenue – a skyscraper in Manhattan that also houses firms, including investment company Blackstone and KPMG.

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Workers at Blackstone used furniture to barricade themselves inside

Blackstone said on Tuesday, “words cannot express the devastation we feel”, as it confirmed a senior managing director, Wesley LePatner, had died in the shooting.

“She was brilliant, passionate, warm, generous, and deeply respected within our firm and beyond. She embodied the best of Blackstone,” said a statement.

The firm said she was married with children.

NFL commissioner Roger Goodell told staff that one of its employees was stable in hospital after being seriously injured in the attack.

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Four dead in New York shooting

Police searched the suspect's car
Image:
Police searched the suspect’s car

CCTV captured Tamura, 27, walking towards the building carrying a rifle after getting out of a black BMW just before 6.30pm.

New York police commissioner Jessica Tisch said he entered the lobby and immediately shot the police officer.

“He then shoots a woman who took cover behind a pillar and proceeds through the lobby, spraying it with gunfire,” she told reporters on Monday.

“He makes his way to the elevator bank where he shoots a security guard who was taking cover behind a security desk.”

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Ms Tisch said Tamura then called for a lift, which opened in the lobby.

“A female exits that elevator and he allows her to walk past him unharmed,” she said.

“He goes up to the 33rd floor… and begins to walk the floor firing rounds as he travelled. One person was struck and killed on that floor,” she continued.

The gunman then fatally shot himself in the chest.

Sources close to the investigation said the note found with Tamura claimed he had been suffering with CTE, a degenerative brain linked to concussion and repeated head impacts common in sports such as American football.