FILE - In this Aug. 6, 2009 file, with the gutted Atomic Bomb Dome as a backdrop, doves fly over the cenotaph of the Peace Memorial Park in Hiroshima, western Japan, as the city marks the 64th anniversary of the atomic bomb attack that devastated the city at the closing days of World War II. In an interview with Japanese broadcaster NHK that ran Tuesday, Nov. 10, 2009, President Barack Obama said he would be unable to visit Hiroshima and Nagasaki on his trip to Japan this weekend due to time constraints but would be willing to do so in the future. (AP Photo/Shizuo Kambayashi, File)