Atomic bombings of Hiroshima and Nagasaki

The United States, with the consent of the United Kingdom as laid down in the Quebec Agreement, dropped nuclear weapons on the Japanese cities of Hiroshima and Nagasaki in August 1945. during the final stage of World War II. The two bombings, which killed at least 129,000 people, remain the only use of nuclear weapons for warfare in history.

Blast: 'Little Boy' - the first atomic bomb one used at war 

This photo shows the total destruction of the city of Hiroshima, Japan, on April 1, 1946.
The atomic bomb known as "Little Boy" was dropped over Hiroshima on Aug. 6, 1945
during World War II from the U.S. AAF Superfortress bomber plane called "Enola Gay

 The war in Europe had concluded when Nazi Germany signed its instrument of surrender on May 8, 1945. The Japanese, facing the same fate, refused to accept the Allies' demands for unconditional surrender and the Pacific War continued. Together with the United Kingdom and China, the United States called for the unconditional surrender of the Japanese armed forces but they refused to surrender. 

On August 6, the U.S. dropped a uranium gun-type atomic bomb (Little Boy) on the city of Hiroshima. American President Harry S. Truman called for Japan's surrender 16 hours later, warning them to "expect a rain of ruin from the air, the like of which has never been seen on this earth". 

The Boeing B-29 Superfortress Enola Gay landing on the Marianas Island after the atomic.

Three days later, on August 9, the U.S. dropped a plutonium implosion-type bomb (Fat Man) on the city of Nagasaki. Within the first two to four months of the bombings, the acute effects of the atomic bombings killed 90,000–146,000 people in Hiroshima and 39,000–80,000 in Nagasaki; roughly half of the deaths in each city occurred on the first day. During the following months, large numbers died from the effect of burns, radiation sickness, and other injuries, compounded by illness and malnutrition. In both cities, most of the dead were civilians. 

Little Boy and Fat Man atomic bombs and their explosions over Hiroshima and Nagasaki, respectively.

On August 15, six days after the bombing of Nagasaki and the Soviet Union's declaration of war, Japan announced its surrender to the Allies. On September 2, it signed the instrument of surrender, effectively ending World War II.

Hiroshima before the bombing.

Hardly any buildings in Hiroshima were left standing
after the massive atomic bomb blast

Hiroshima shortly after the atomic bomb was dropped

Hiroshima after the atomic bombing.

Photos of the Prefectural Industrial Promotion Building before (inset) and after the bombing of Hiroshima.
The remains were later preserved as the Hiroshima Peace Memorial, Atomic Bomb Dome or Genbaku Dome.
The Atomic Bomb Dome was the only building to survive.

Nagasaki before bombing

Nagasaki after bombing

Picture source: Collected from Internet