In this photo provided by the City of Hiroshima, U.S. Ambassador to Japan John Roos, left, greets Hiroshima city's Mayor Tadatoshi Akiba on his arrival at the Hiroshima Peace Memorial Park to attend the 65th anniversary of the world's first atomic bombing in Hiroshima, western Japan Friday, Aug. 6, 2010. The United States sent its first ever delegation to the ceremony marking the anniversary of the attacks. (AP Photo/City of Hiroshima)
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