These bombings were conducted by the United States of America, which dropped twoa tomic bombs on Hiroshima and Nagasaki, Japan. Hiroshima's attack was on August 6, 1945. Nagasaki's was three days later. For six months before that, the US, the United Kingdom, and China declared for Japan to surrender the war, who ignored the ultimatum. By order of President Harry S. Truman, the US dropped "Little Boy" over Hiroshima. Three days later, "Fat Man" was dropped on Nagasaki.
Up to four months after the incident, people were still dying. Total, about 246,000 people were killed. Later, the Hiroshima Health Department, released information, saying that 60% died from flame burns and flash, 20% died from radiation illness, and the other 20% died from falling debris.