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9/11: Ten years later

September 11, 2001 AttacksPort Authority of New York and New JerseyLocal Government
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,... Photo by Chip Somodevilla/Getty Images