One World Trade Center being built 30 April 2012
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"It's bittersweet": Rebuilding the World Trade Center

1 May 2012 Last updated at 01:03 BST

After years of delays and a major redesign, One World Trade Center has reclaimed the title of tallest building in New York City.

The BBC's Laura Trevelyan talked to several New Yorkers on the day 1 WTC reclaimed the record previously held by the Twin Towers, destroyed in the 9/11 attacks, with a single steel beam fitted into place.

"It's bittersweet," one construction worker said. "It's a beautiful thing we're up there, but it's a terrible reason we have to put it up."