Tens of thousands of attendants stood for a minute of silence at 8-30 a.m. at the ceremony in Hiroshima’s peace park near the epicentre of the 1945 attack, marking the moment of the atomic blast. Then dozens of doves were released as a symbol of peace. The U.S. bomb, “Little Boy,” the first one used at war, killed 140,000 people, and a second bomb “Fat