U.N. Secretary-General Ban Ki-moon offers a wreath in front of the cenotaph for atomic bomb victims at Peace Memorial Park in Hiroshima August 6, 2010, on the 65th anniversary of the world's first atomic bombing on the city. The Japanese city of Hiroshima, reduced to ashes by a U.S. nuclear bomb in 1945, held its annual commemoration of that attack on Friday, but this will be the first year that a U.S. representative will take part. [Agencies]