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NEW YORK, NY - MAY 12: Construction continues at the World Trade Center site Ground Zero on May 12, 2011 in New York City. More than 2,700 people were killed when hijacked U.S. passenger jets flew into the twin towers of the World Trade Center on September 11, 2001. Nearly ten years after the crippling attacks on Lower Manhattan, business, tourism and new construction like One World Trade Center have rejuvenated the formerly devastated cityscape. (Photo by Per-Anders Pettersson/Getty Images)