Hiroshima is stepping up efforts to keep the memories of the calamity alive, as the survivors of the bombing, known as hibakusha, get older.
Japanese PM Shinzo Abe, whose government has chosen not to participate in the UN Treaty on the Prohibition of Nuclear Weapons ,said at the official ceremony his country's responsibility was to bridge the gap between nuclear and non-nuclear nations.
Thousands of people died instantly after the US dropped an atomic bomb on Nagasaki on August 9, 1945. The attack came just three days after the US dropped the first-ever atomic bomb on Hiroshima.
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