The two workers who were trapped on the damaged scaffold have now been rescued, NBC New York reports.
An employee for Hearst TV, who works in the building where the workers are trapped, has tweeted that the lower three floors have been evacuated in case the scaffold collapses.
The New York City Fire Department has confirmed that firefighters are opening windows on the 44th floor of the Hearst Tower to try to take the workers in through them.
Emergency service workers are trying to rescue two workers stuck on a damaged piece of scaffolding 45 storeys up in New York.
ABC News reports that they are trying to get the workers back into the building through windows on the 44th floor.
The workers appear to be moving and responding to instructions.
Watch live video of the rescue of two workers from a New York skyscraper unfolding on the ABC website.
NBC New York reports that the two workers have been secured using ropes, and emergency workers are trying to find a way of winching them to safety.
Parts of the streets below, on 57th and 58th streets and Eighth Avenue, have been closed off.
A tweet from the New York City Fire Department says that the two workers are trapped on the 45th floor - one level short of the roof.
NBC New York reports that 60 fire officers are attending the scene.
Two workers are stuck on a damaged piece of scaffolding near the top of the 46-storey Hearst Tower, at the southern end of Central Park in New York.
The building stands at 182 metres (597 feet).
The building houses media company Hearst Corporation, which publishes magazines like Cosmopolitan and Esquire, and runs a number of television stations.
Two workers are trapped on a broken piece of scaffold near the top of the 46-storey Hearst Tower in New York City, NBC News reports.
Emergency workers are at the scene.
The damaged equipment appears to be a platform used for cleaning and maintenance.