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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.
American bomber drops atomic bomb on Hiroshima. On this day in 1945, at 8:16 a.m. Japanese time, an American B-29 bomber, the Enola Gay, drops the worldâs first atom bomb, over the city of Hiroshima. Approximately 80,000 people are killed as a direct result of the blast, and another 35,000 are injured.