9/11: Ten years later

New York police and firefighters and Port Authority police salute during the singing of the Star Spangled Banner at one of the entrances of 9/11 Memorial Plaza during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City

( Photo by Chip Somodevilla/Getty Images )

New York police and firefighters and Port Authority police salute during the singing of the Star Spangled Banner at one of the entrances of 9/11 Memorial Plaza during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City

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