An incident reported as a "nuclear incident in the US" occurred at the Savannah River National Laboratory, according to a report published on the Savannah River website, a facility under the National Nuclear Security Administration that was declared a fire emergency earlier today in place of a fire that has since been extinguished. The report states: "No cases of contamination outside the affected area were detected. "In addition to the precautionary measures taken, a temporary no-fly zone was established over the area. Source: Terry.