The Hiroshima atom bomb cloud 2–5 minutes after detonation[136]

Hiroshima's warning had already ended

On the morning of 6 August 1945, Hiroshima's air raid warning was cleared. Many people were outside, going about ordinary life, when everything changed.

Hiroshima Atomic Bombing: What Survivors Saw

A photograph of the aftermath of the bombing of Hiroshima

One flash, then one boom

Survivors described a pika(Japanese for a sudden flash.)—a brilliant flash—followed by a don(Japanese for a deep boom or blast.)—a crashing sound. Many thought a conventional bomb had exploded right beside them.

Hiroshima Atomic Bombing: What Survivors Saw

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