A fire has broken out on the 88th floor of One World Trade Centre in New York.
The size of the fire is not yet clear but reports say some 24 fire engines and 84 firefighters are on the scene.
There are no reports of injuries.
The tower is the centerpiece of the construction at the site of the 9/11 attacks. The building is still under construction and is now the tallest in New York City.
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