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Office of Environmental Management
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Office of Environmental Management
August 1945

The United States dropped atomic bombs on Hiroshima and Nagasaki, Japan. On August 6, 1945, a B-29 bomber--the Enola Gay--released a 9,700-pound uranium bomb, nicknamed Little Boy, over the city of Hiroshima in southern Japan. Hiroshima was an important military and communications center with a population of 300,000. It was also the only primary target city not thought to have American prisoners. Little Boy detonated 1,900 feet above the city, killing 70,000 people and wounding another 70,000. The bomb devastated everything within five square miles. President Truman warned Japan that if it didn't surrender, the United States would attack other targets with equally devastating results.

The Japanese did not surrender, and the United States continued conventional bombing raids on Japanese cities. On August 9, another B-29 bomber--Bock's Car--headed to bomb Kokura Arsenal; however, the pilot switched to his secondary target, Nagasaki, because of the weather over Kokura. Nagasaki was the home of a Mitsubishi torpedo manufacturing plant. Bock's Car dropped a 10,000-pound plutonium bomb, nicknamed Fat Man, over the slopes of Nagasaki. Fat Man killed 40,000, injured 60,000, and destroyed three square miles of the city. Japan surrendered on August 14, 1945.

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