The bomb proved more powerful and efficient than the gun-type device used at Hiroshima, which had an explosive force of between 12 and 18 kilotons. But the damage was less severe in Nagasaki. A series of hills protected much of the city from the blast wave, and a firestorm never erupted, despite winds that reached more than six hundred miles an hour. About forty thousand people were killed in Nagasaki, at least twice that number were injured, and more than one third of the homes were destroyed. Ground zero was approximately five hundred feet south of the Mitsubishi Steel Works. According to
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