Tributes to 9/11 victims across the U.S.

Associated Press
Spectators watch as local firefighters, police, EMS and military members ascend the Sunsphere during the Knoxville 9-11 Memorial Stair Climb on Saturday, Sept. 20, 2014, in Knoxville, Tenn.  Participants climbed the equivalent of the 110 stories of the World Trade Center to honor 343 New York Fire Department firefighters. (AP Photo/Knoxville News Sentinel, Adam Lau)

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Tributes were held around the country for the 10th anniversary of the Sept. 11 terrorist attacks on the U.S.

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