New Ground Zero designs unveiled
Plans for three new skyscrapers to sit alongside Freedom Tower on the site of the World Trade Center in New York have been unveiled by architects.
The towers will descend in height in a semicircle around the memorial to the victims of the 11 September attacks.
The designs complete plans for Ground Zero, where the showpiece Freedom Tower is already under construction.
But five years on, frustration is growing over the lack of actual rebuilding work, correspondents say.
British architects Norman Foster and Richard Rogers have each designed one of the new towers, as has Fumihiko Maki of Japan.
Each building will be covered in glass and the tallest will stand as high as the city's iconic Empire State Building.
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