The United States Dropped 4 Nukes on Spain, accidentally

This story has everything. It was the 1960's and before we had missiles that could travel around the world and knock out an entire city... Planes flew in the air around the click armed with Nuclear Bombs. In 1966 while refueling over Spain an American bomber crashed into the refueling plane creating a massive fireball... and Dropping four nuclear bombs onto Spain. Creating the Most Radioactive city in Europe.