U S B-29 Bomber, dropped the nuclear bomb " Little Boy" on Hiroshima 70 years before, on 6 August 1945. Around 140,000 of its 350,000 citizens were killed in this tragic disaster. Seventy percentage of the buildings were completely destroyed and 7% were severely destroyed. After only three days of Hiroshima, On August 9, 1945 " Fat Boy" Bomb was dropped on Nagasaki. Around 80,000 people died in this attack. On the 70th anniversary of the bombing, see, before and after images of Hiroshima and Nagasaki after the blast.