Right after the disaster
Once the explosion happened multiple fires and explosions followed right after the event .But the major problem was the radiation that was spread through the atmosphere.There was a town nearby called Pripyat that once news spread to the town it was to late. The radiation let out by the explosion was more radiation than the two nukes dropped on Hiroshima and Nagasaki the two Japanese towns that where bombed in World War II. The death rate after the radiation was 4,000.