13 of 20: Alyson Low, of Fayetteville, Ark., holds a photo of her sister Sara Low as friends and relatives of the victims of the Sept. 11, 2001 attacks gather for a commemoration ceremony at Zuccotti Park, adjacent to ground zero, on the ninth anniversary of the terrorist attacks on the World Trade Center, Saturday, Sept. 11, 2010 in New York. ((AP Photo/Jason DeCrow))

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