An example of intentional nuclear disaster is the attacks carried out on Hiroshima and Nagasaki cities in Japan by the United States during World War II. An example of unintentional nuclear disaster is an accidental explosion at a nuclear plant in Chernobyl in the former USSR in 1986 which caused radiation to spread across Ukraine and other regions. As many as 12,000 Ukrainians died in the chernobyl disaster.
