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The bomb exploded over Hiroshima at 8:15 on the morning of August 6, 1945. About an hour previously, the Japanese early warning radar net had detected the approach of some American aircraft headed for the southern part of Japan.
Hiroshima: the first city destroyed by a nuclear weapon. On August 6, 1945, the Japanese city of Hiroshima was destroyed by a nuclear weapon, an atomic bomb dropped by the United States. Three days later, a second atomic bomb was dropped on the city of Nagasaki; five days after that, Japan unconditionally surrendered to the United States, bringing an end to World War II.