Apart from the 120,000 that died instantly when the bombs were dropped, more than 100,000 people died from radiation poisoning. To this day, those two world war 2 atomic bomb attacks remain the only nuclear bomb attacks in history. Three days later, another bomb was dropped on the city of Nagasaki resulting in an additional 40,000 deaths. When was the Atomic Bomb Dropped on Hiroshima, Japan?Īround 8:15 AM on August 6 1945, an atomic bomb was dropped on Hiroshima, the explosion instantly killed over 80,000 people. 4 Atomic Bombings of Hiroshima and Nagasaki.3 When was the First Atomic Bomb Test Conducted?.1 When was the Atomic Bomb Dropped on Hiroshima, Japan?.