He is the first Japanese prime minister to visit the site of the attack since 1951.
Tensions brim as Pyongyang celebrates the testing of a nuclear missile that caused a quake similar to the one caused by the atomic bomb dropped on Hiroshima.
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.
Obama, who is presently in Japan to attend the G7 summit, is the first American president to visit Hiroshima, seven decades after its bombing.
President Barack Obama touched down in Japan on Wednesday, kicking off a historic visit which will see him become the first incumbent US president to visit Hiroshima.
Barack Obama will become the first US president to visit Hiroshima in Japan later this month
Secretary of State John Kerry will not apologise over Hiroshima bombing from US during his Japan visit
Foreign ministers from G7 countries gather in Hiroshima to discuss nuclear, maritime issues, refugee crisis and terrorism
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