Hiroshi Harada remembers how his leg sank into one of the bodies blocking a narrow Hiroshima street 70 years ago, as he fled the spreading fire ignited by the atomic bomb.

"My leg slid deep into one of them. Then it was very hard to pull my leg out. . . . To escape, I had no choice," said Harada, the 75-year-old former head of the atomic bomb museum.

Later that day, a woman grabbed Harada, then just 6 years old, by the leg and asked for water. He stepped back in horror to find a chunk of flesh from her hand sticking to his leg.