Whenever Lee Jong-keun speaks to children about his experience as a Hiroshima A-bomb survivor, he begins by showing them a picture of the mushroom cloud. Then the 90-year-old Korean explains that Japanese were not the only people who died.

When it reopened in April after a two-year renovation, the main building of the Hiroshima Peace Memorial Museum had set up a new section featuring foreign victims for the first time.

Estimates of the foreign deaths caused by the 1945 U.S. atomic bombings of Hiroshima and Nagasaki range from several thousand to tens of thousands for each, according to the cities. People from the Korean Peninsula, which was then under Japanese colonial rule, are believed to have accounted for the vast majority.