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.
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New research suggests metal-on-metal hip replacements implanted since 2006 are more prone to failure and they "fail in a much nastier way".
With the force facing legal action from the families of the Hillsborough victims, ITV News looks at the web of lies which led them here.