The Tribute in Lights is illuminated between the Williamsburg Bridge (L) and One World Trade Center (R) for a test prior to events marking the 10th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept 10, 2011. National and city leaders will commemorate on Sunday the ten-year anniversary of the attacks of Sept 11, 2001 with a ceremony unveiling a memorial and museum. [Photo/Agencies]

The Tribute in Lights is illuminated on the skyline of Lower Manhattan during events marking the 10th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept 10, 2011. New York will mark the 10th anniversary of the 9/11 attacks on the World Trade Center with ceremonies on Sunday. [Photo/Agencies]