Firefighters say people are trapped under rubble after a three-storey building in Brooklyn collapsed.
Footage from news helicopters has shown dozens of rescuers scouring debris for survivors - and appearing to use a saw to cut through the wreckage.
Crews were seen pulling someone from the rubble and placing them on a stretcher, passing them carefully from person to person.
The New York City Fire Department says one person has been killed - and four others have been taken to hospital in critical condition.
At this stage, it is believed six people are being treated for minor injuries.
The collapse happened close to where another structure had been torn down for a construction project.
A building that shared a wall with the collapsed property remains standing but exposed - exposing bedrooms and closets filled with clothing.
As darkness fell, firefighters deployed sniffer dogs and used flashlights to illuminate the area where they worked.
New York City's mayor, Zohran Mamdani, wrote on social media: "As emergency operations continue, please join me in holding our neighbours and the members of this community in our hearts."
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(c) Sky News 2026: People feared trapped after building collapses in New York
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