Barack Obama has become the first serving US President to visit the Japanese city of Hiroshima.
At least 140,000 people died there in August of 1945 – as a result of the worlds first nuclear bombing.
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Two days later a second nuclear bomb was dropped on Nagasaki, killing another 74,000.
Mr Obama -who is in Japan for the G7 summit – said his visit was "a testament to how even the most painful of divides can be bridged".
However he also said the US would not be apologising for the attack.