There wasn't a massive explosion to coincide with this contamination, but a piece of medical equipment and a couple of guys looking to sell it for scrap, led to the largest radioactive contamination in America.
"This ruling is Iran's Nuremberg Law, something the Grand Ayatollah and his gang believe will lead to a new Age of the S#!+...sorry. I should be careful, here: Age of the Shiite, Shiite being the largest denomination of Islam in Iran."