8:15 am on August 6, 1945
The first atomic bomb used against humans was dropped on Hiroshima, Japan.
As the US Boeing B-29 Bomber, named Enola Gay, flew away from Hiroshima, this picture taken from the plane shows to Atomic Bomb cloud over Hiroshima on August 6, 1945.
The Hiroshima City memorial page reports: The City of Hiroshima estimates that approximately 140,000 people had died by the end of December 1945, when the acute effects by the radiation subsided.
It is thought that approximately 350,000 people were in the city when the bomb exploded on August 6, 1945. This figure includes ordinary citizens, military personnel, and people from surrounding towns and villages who commuted to work or were mobilized for building demolition work. Those who were involved in the tragedy were not only Japanese, but also people with various nationalities, such as Japanese-Americans who were born in the US, German priests, exchange students from countries in Southeast Asia, people from Korea and Taiwan, which were then Japanese colonies, and mainland China, as well as US prisoners of war.
Approximately half of those who were within 1.2 kilometers from the hypocenter died within the day; 80 to 100 percent of those who were closer to the hypocenter are thought to have died. Even among those who were able to escape an instant death or death within the day, the closer they were exposed to the bombing, and the more serious damages they suffered, the higher mortality rate they had.