U.S. Ambassador to Japan John Roos, center, and Hiroshima Mayor Tadatoshi Akiba , left, pray for the victims of the atomic bombing at the Memorial Cenotaph for A-Bomb Victims at Peace Memorial Park in Hiroshima, western Japan, Sunday, Oct. 4, 2009. AP Photo logo AP Photo 28 months ago

U.S. Ambassador to Japan John Roos, center, and Hiroshima Mayor Tadatoshi Akiba , left, pray for the victims of the atomic bombing at the Memorial Cenotaph for A-Bomb Victims at Peace Memorial Park in Hiroshima, western Japan, Sunday, Oct. 4, 2009.