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NEW YORK, NY - SEPTEMBER 10: New York City's Tribute In Light shines above a Brooklyn street on the eve of the twelfth anniversary of the terrorist attacks at the World Trade Center on September 10, 2013 in New York City. New York City and the nation will commemorate the eleventh anniversary of the September 11, 2001 attacks, which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center towers, one into the Pentagon in Arlington, Virginia and one into a field outside OF Shanksville, Pennsylvania. (Photo by Mario Tama/Getty Images) ( 180257951 )

NEW YORK, NY - SEPTEMBER 10: New York City's Tribute In Light shines in Manhattan (R) as a Brooklyn subway passes on the eve of the twelfth anniversary of the terrorist attacks at the World Trade Center on September 10, 2013 in New York City. New York City and the nation will commemorate the eleventh anniversary of the September 11, 2001 attacks, which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center towers, one into the Pentagon in Arlington, Virginia and one into a field outside OF Shanksville, Pennsylvania. (Photo by Mario Tama/Getty Images) ( 180257950 )

CORRECTS YEAR OF TERROR ATTACKS TO 2001, INSTEAD OF 2011 - The Tribute in Light rises above the lower Manhattan skyline and Four World Trade Center, center, and One World Trade Center, left, in a test of the memorial light display, Monday, Sept. 9, 2013 in New York. The twin beams of light will also appear Wednesday, Sept. 11, twelve years after the terrorist attacks of Sept. 11, 2001. (AP Photo/Mark Lennihan) ( CORRECTION CORRECTION Sept 11 Tribute in Light )

NEW YORK, NY - SEPTEMBER 10: Pedestrians pass a sidewalk vendor selling artwork featuring the Twin Towers on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232761 )

NEW YORK, NY - SEPTEMBER 10: A visitor peers into the 9/11 Museum, which is still under construction, on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232488 )

NEW YORK, NY - SEPTEMBER 10: Drops of water fall in the fountain of the 9/11 Memorial on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232454 )

NEW YORK, NY - SEPTEMBER 10: A flower lies atop names of victims at the 9/11 Memorial on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232490 )

NEW YORK, NY - SEPTEMBER 10: Visitors to the 9/11 Memorial photograph the mostly-completed One World Trade tower on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232458 )

NEW YORK, NY - SEPTEMBER 10: A beam from the World Trade Center is seen inside the 9/11 Museum, which is still under construction, on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232460 )

NEW YORK, NY - SEPTEMBER 10: Visitors to the 9/11 Memorial look towards the mostly-completed One World Trade tower on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232484 )

NEW YORK, NY - SEPTEMBER 10: A visitor to the 9/11 Memorial takes photos on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232455 )

NEW YORK, NY - SEPTEMBER 10: Visitors to the 9/11 Memorial look towards the mostly-completed One World Trade tower on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232456 )

NEW YORK, NY - SEPTEMBER 10: A visitor to the 9/11 Memorial photographs the mostly-completed One World Trade tower on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232487 )

NEW YORK, NY - SEPTEMBER 10: A mobile police security tower stands outside the 9/11 Memorial on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232751 )

NEW YORK, NY - SEPTEMBER 10: A photograph of a 9/11 victim lies atop the 9/11 Memorial on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232758 )

NEW YORK, NY - SEPTEMBER 10: Visitors to the 9/11 Memorial look at the names of victims on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232516 )

NEW YORK, NY - SEPTEMBER 10: A waterfall cascades at the 9/11 Memorial on September 10, 2013 in New York City. Tomorrow marks the 12th anniversary of the attacks of September 11, 2001 that killed almost 3,000 people. The 9/11 Memorial has become a major tourist attraction for visitors to New York City. (Photo by John Moore/Getty Images) ( 180232493 )

NEW YORK, NY - SEPTEMBER 10: New York City's Tribute In Light shines near One World Trade Center (Top, R) in Manhattan on the eve of the twelfth anniversary of the terrorist attacks at the World Trade Center on September 10, 2013 in New York City. New York City and the nation will commemorate the eleventh anniversary of the September 11, 2001 attacks, which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center towers, one into the Pentagon in Arlington, Virginia and one into a field outside OF Shanksville, Pennsylvania. (Photo by Mario Tama/Getty Images) ( 180257952 )

In a photo made with a fisheye lens, the Tribute in Light rises above buildings in lower Manhattan, during a test, Tuesday, Sept. 10, 2013 in New York. The light display commemorates the twin towers of the World Trade Center that were destroyed in terrorist attacks 12 years ago on Sept. 11, 2001. (AP Photo/Mark Lennihan) ( Sept 11 Tribute in Light )

In a photo made with a fisheye lens, the Tribute in Light rises above buildings in lower Manhattan, during a test, Tuesday, Sept. 10, 2013 in New York. The light display commemorates the twin towers of the World Trade Center that were destroyed in terrorist attacks 12 years ago on Sept. 11, 2001. (AP Photo/Mark Lennihan) ( APTOPIX Sept 11 Tribute in Light )