actually many. look up broken arrow, the US codename for a nuclear weapon accident. none had a nuclear explosion, although many had explosions or fires of chemical explosives.
There was an accident involving the US over Spain and not on Nish.
The US dropped the atomic bomb onto Japan on August 1945.
No bomb was dropped on Denmark.
Hiroshima
many, these are called broken arrows, the code-name for an accident with a nuclear weapon.
Japan, to end WWII.
Japan
On the 6th August 1945 the first atomic bomb was dropped on the Japanese city of Hiroshima. Three days later, a second bomb was dropped on Nagasaki.
Actually it was two atomic bombs.
The first atomic bomb was dropped on Hiroshima, Japan ; another on Nagasaki, Japan, 3 days later.
Hiroshima, Nagasaki. Japan
It was called war.