The Castellers de Vilafranca team build a human tower, or castell, on a skysraper roof in Manhatten as part of a bid to set a new world record.
The 150-strong Castellers de Vilafranca team took about five minutes to get into position.
Cheers erupted when the final child, wearing a safety helmet, topped the precarious human tower.
Earlier, the team had built an eight-person high human tower, apparently setting a new Guinness World Record.
The performance is the first in a series of events being held to celebrate the rebuilding of the World Trade Center complex that was destroyed by terrorists in 2001.
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