At least five people, including an off-duty police officer, have been shot and killed in a New York office building that houses some of the country’s top financial firms and the National Football League (NFL), sources have told AP.

New York City police converged on a Park Avenue skyscraper in midtown Manhattan after gunshots were reported fired inside the tower, police said.

If you or anyone you know needs help:Suicide Call Back Service on 1300 659 467Lifeline on 13 11 14Aboriginal & Torres Strait Islander crisis support line 13YARN on 13 92 76Kids Helpline on 1800 551 800Beyond Blue on 1300 224 636Headspace on 1800 650 890ReachOut at au.reachout.comMensLine Australia on 1300 789 978QLife 1800 184 527

The suspect was identified as Shane Tamura of Nevada, two people briefed on the investigation told AP.

Law enforcement officials located identification on Mr Tamura’s body, including a concealed carry permit from Las Vegas, the people said.

US media outlets, including The New York Post and CNN, citing police sources, reported that the gunman killed himself.

New York City police commissioner Jessica Tisch said in a post on social media site X that the “lone shooter” had been “neutralised”.

The Fire Department of New York said emergency crews were called to the Park Avenue office building following a report someone had been shot.

A spokesperson said the call came in at about 6:30pm on Monday, local time, but provided no other details.

Ambulance stretchers sit on the street in front of a New York ambulance.

Stretchers are prepared as emergency services gather in Manhattan. (Reuters: Jeenah Moon)

‘Multiple shots in quick succession’

Jessica Chen told ABC News US she was watching a presentation with dozens of other people on the second floor when she “heard multiple shots go off in quick succession from the first floor”.

She and others ran into a conference room and barricaded tables against the door.

“We were honestly really, really scared,” she said, adding that she texted her parents to tell them that she loved them.

Mayor Eric Adams said multiple people were injured.

He posted a clip to social media urging people still inside the office building to stay put because police officers were conducting a floor-by-floor search.

The Democrat said he was headed to the hospital to speak with the family and loved ones of those involved.

Local TV footage showed lines of people with their hands above their heads evacuating the office building.

The building includes offices for Blackstone and the Consulate General of Ireland.

FBI deputy director Dan Bongino said in a social media post that agents and other bureau personnel were responding to provide support to what he said was an “active crime scene”.

The city’s emergency management alert system warned of traffic delays, road closures and disruptions to public transportation in the area.