The nuclear weapon was first detonated in combat on 6 August 1945, when the United States dropped a uranium gun-type device on the Japanese city of Hiroshima. The second and last use of a nuclear weapon in combat occurred three days later when United States dropped a plutonium implosion-type device on the Japanese city of Nagasaki. These bombings resulted in the immediate deaths of around 120,000 people while more died over time due the nuclear radiation. 