How many people were killed immediately in the Hiroshima bombing?

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Atomic bombing of Hiroshima — atomic bombings of Hiroshima and Nagasaki A gigantic mushroom cloud rising above Hiroshima, Japan, on August 6, 1945, after a U.S. aircraft dropped an atomic bomb on the city, immediately killing more than 70,000 people.

Approximately 70,000 people were killed outright or shortly after the atomic bomb was dropped on Hiroshima on August 6, 1945.12

While exact figures are difficult to determine due to the scale of the destruction and the omission of certain population groups in early investigations, it is estimated that by the end of 1945, the death toll had risen to approximately 140,000 people.132