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.
More top news
The Prime Minister has created a taskforce and boosted the amount of money available to tackle 'barbaric' modern slavery.
Harry Potter and the Cursed Child will be released around the world at midnight.
The popular HBO TV show will finish after its eighth season, the network said.