At approximately 8.15 am on 6 August 1945 a US B-29 bomber dropped an atomic bomb on the Japanese city of Hiroshima, instantly killing around 80,000 people. Three days later, a second bomb was dropped on Nagasaki, causing the deaths of 40,000 more. The dropping of the bombs, which occurred by executive order of US President Harry Truman, remains the only nuclear attack in history. In the months following the attack, roughly 100,000 more people died slow, horrendous deaths as a result of radiation poisoning.