This August 6, 1945, file photo released by the US Air Force shows the total destruction of Hiroshima in Japan, as the result of the first atomic bomb dropped. An estimated 140,000 people, including those with radiation-related injuries and illnesses, died through December 31, 1

This August 6, 1945, photo shows, smoke rising from 20,000 feet above Hiroshima, western Japan, after the first atomic bomb was dropped during warfare. (Image: AP file)

This August 6, 1945, photo released by US Air Force shows, a column of smoke rises 20,000 feet over Hiroshima, western Japan, after the first atomic 5-ton Little Boy" bomb was dropped during warfare. (George R. Caron/US Air Force via AP, File)

This August 6, 1945, photo released by the US Air Force shows, white smoke rising from the detonation of the atomic bomb over Hiroshima, western Japan. (U.S. Air Force via AP, File)

This August 8, 1945, photo shows soldiers and civilians walk through the grim remains of Hiroshima in Japan, two days after the atomic bomb explosion. The building on left with columned facade was the Hiroshima Bank. To its right, with the arched front entrance, was the Sumitom

This September 7, 1945, file photo, an unidentified man stands next to a tiled fireplace where a house once stood in Hiroshima, Japan. August 6, 1945, bombing was the world’s first nuclear attack. (AP Photo/Stanley Troutman, Pool, File)

This August 6, 1945, file photo shows survivors are seen as they receive emergency treatment by military medics shortly after the first atomic bomb ever used in warfare was dropped by the United States over Hiroshima in Japan. (Image: AP file)

This August 7, 1945, file photo shows Col. Paul W Tibbets, standing, pilot of the B-29 Enola Gay which dropped the atomic bomb on Hiroshima in Japan, describes the flight during a news conference at Strategic Air Force headquarters on Guam, one day after the atomic bombing. At

This September 5, 1945, aerial photo shows the landscape of Hiroshima, shows widespread rubble and debris, one month after the atomic bomb was dropped. (Image: AP file)