In August 6, 1945, the United States dropped the first nuclear weapon, a uranium gun-type bomb (Little Boy), on Hiroshima, during the final stage of the Second World War.
The Boeing B-29 Superfortress Enola Gay released the Little Boy at 08:15 which contained about 64 kg of Uranium-235 which exploded 2,000 feet above Hiroshima. The Aioi Bridge, which was the target was missed due to the crosswinds, by approximately 800 ft (240 m) and detonated directly over Shima Surgical Clinic at 34.39468°N 132.45462°E. Around 90,000 – 166,000 people were killed of the total population of approximately 340,000 – 350,000 in Hiroshima.
Hiroshima – Then and now images