A fire “involving uranium” broke out at a National Security Complex in Tennessee. The location is also home to the Manhattan Project from World War II, where the first nuclear weapons were developed. It is estimated that about 2 million people around the area were exposed to small amounts of radiation.
From The Daily Mail:
Building 9212 is listed on the Department of Energy website as a uranium processing building, constructed in 1945. It serves 'as one of the primary chemical processing and enriched uranium production facilities at Y-12.'