FILE - Kazumi Matsui, right, mayor of Hiroshima bows, at Hiroshima Memorial Cenotaph, at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, Aug. 6, 2015. The Nobel Peace Prize has been awarded to Nihon Hidankyo, a Japanese organization of survivors of the U.S. atomic bombings of Hiroshima and Nagasaki, for its activism against nuclear weapons. (AP Photo/Eugene Hoshiko, File)