Two workers are stuck on collapsed scaffolding 69 storeys above the ground at the World Trade Center in Manhattan.
The Fire Department of New York told the BBC the two people were uninjured and tethered. The call came in at 12:42 ET and they was on the scene in less than four minutes, a spokesman said.
One World Trade is the nation's tallest skyscraper. Television images showed one side of the scaffolding had dropped at a precarious angle.