About 30 minutes after the initial explosion in Hiroshima, heavy rain began falling in areas northwest of the city. This rain was full of dirt, dust, soot and highly radioactive particles that were sucked up into the air at the time of the explosion and during the fire. The "black rain" caused contamination in areas that were not even close to the explosion.
August 6, 1945 – Hiroshima, Japan is devastated when the atomic bomb "Little Boy" is dropped by the United States B-29 Enola Gay. Around 70,000 people are killed instantly, and some tens of thousands die in subsequent years from burns and radiation poisoning