Blast victims shown in a fly-infested makeshift hospital in a bank building in Hiroshima. 15th September; 1945. The atomic bomb "Little Boy"; was dropped on Hiroshima by an American B-29 bomber; the Enola Gay; flown by Colonel Paul Tibbets; directly killing an estimated 80;000 people. By the end of the year; injury and radiation brought the total number of deaths to 90;000-166;000. Hiroshima; Japan.