<P> The radius of total destruction was about 1 mi (1.6 km), followed by fires across the northern portion of the city to 2 mi (3.2 km) south of the bomb . About 58% of the Mitsubishi Arms Plant was damaged, and about 78% of the Mitsubishi Steel Works . The Mitsubishi Electric Works suffered only 10% structural damage as it was on the border of the main destruction zone . The Nagasaki Arsenal was destroyed in the blast . Although many fires likewise burnt following the bombing, in contrast to Hiroshima where sufficient fuel density was available, no firestorm developed in Nagasaki as the damaged areas did not furnish enough fuel to generate the phenomenon . Instead, the ambient wind at the time pushed the fire spread along the valley . </P> <P> As in Hiroshima, the bombing badly dislocated the city's medical facilities . A makeshift hospital was established at the Shinkozen Primary School, which served as the main medical centre . The trains were still running, and evacuated many victims to hospitals in nearby towns . A medical team from a naval hospital reached the city in the evening, and fire - fighting brigades from the neighboring towns assisted in fighting the fires . Takashi Nagai was a doctor working in the radiology department of Nagasaki Medical College Hospital . He received a serious injury that severed his right temporal artery, but joined the rest of the surviving medical staff in treating bombing victims . </P> <P> Groves expected to have another atomic bomb ready for use on August 19, with three more in September and a further three in October . On August 10, he sent a memorandum to Marshall in which he wrote that "the next bomb...should be ready for delivery on the first suitable weather after 17 or 18 August ." Marshall endorsed the memo with the hand - written comment, "It is not to be released over Japan without express authority from the President", something Truman had requested that day . This modified the previous order that the target cities were to be attacked with atomic bombs "as made ready". There was already discussion in the War Department about conserving the bombs then in production for Operation Downfall, and Marshall suggested to Stimson that the remaining cities on the target list be spared attack with atomic bombs . </P> <P> Two more Fat Man assemblies were readied, and scheduled to leave Kirtland Field for Tinian on August 11 and 14, and Tibbets was ordered by LeMay to return to Albuquerque, New Mexico, to collect them . At Los Alamos, technicians worked 24 hours straight to cast another plutonium core . Although cast, it still needed to be pressed and coated, which would take until August 16 . Therefore, it could have been ready for use on August 19 . Unable to reach Marshall, Groves ordered on his own authority on August 13 that the core should not be shipped . </P>

Who was president when the atomic bombs were dropped