On August 6, 1945, U.S. forces dropped an atomic bomb on the city of Hiroshima in southwestern Japan. The bomb, which contained 12.5 kilotons of explosive power, killed 72,000 civilians and caused damage on a scale unequalled by any prior human-made bomb in history. Three days later, the United States dropped another atomic bomb on the city of Nagasaki. Japan announced its surrender the following day. While the bombings of Hiroshima and Nagasaki undoubtedly expedited the end of World War II, the decision to use atomic force continues to be a controversial topic.