The speaker of the US House of Representatives has laid flowers at a Japanese memorial to atom bomb victims.
Nancy Pelosi, a Democrat, is the highest ranking US figure to visit the site in Hiroshima, the first city in the world to suffer a nuclear attack.
More than 140,000 people were killed by the American bomb, dropped towards the end of World War II in 1945.
Mrs Pelosi is in Japan for a meeting of parliamentary speakers from the Group of Eight (G8) major industrial nations.
Mrs Pelosi and the other G8 delegates visited Hiroshima's Peace Memorial Park before heading into an all-day meeting.
See a graphic showing how the Hiroshima attack took place
The speaker of the House of Representatives is the third most senior politician in the US, after the president and vice-president.
Although former President Jimmy Carter visited the memorial in 1984, his presidency had ended at the time and the visit was not made in any official capacity.
The bombing of Hiroshima marked the beginning of the end of the war in the Pacific.
A US B-29 plane dropped the five-tonne "Little Boy" bomb on the morning of 6 August 1945.
Three days later, a second nuclear bomb was dropped on the city of Nagasaki, killing about 80,000 people.
Japan surrendered a week later.
THE ATTACK ON HIROSHIMA
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