In the summer of 1945, a jittery premonition marked the lives of the citizens of Hiroshima, as B-29 super fortresses—planes that the Japanese locals called B-San or Mr.B—had been stationed in the northeast corner of the fan-shaped city. Americans had been bombing Japan for months except in two key cities: Kyoto and Hiroshima. A rumour was lurking around, however, that the Americans were saving something special for Hiroshima. The prefectural government, sensing impending attacks, had ordered completion of wide fire lanes, hoping it would contain fire caused by raids. The depraved radioactivity of the fire to come was something that no one had comprehended.