Reuters: A second container of plutonium-contaminated debris may have contributed to a radiation leak that has led to the indefinite suspension of operations at an underground nuclear waste dump in New Mexico, a U.S. Energy Department official said on Thursday. Preliminary findings from an investigation of a Feb. 14 accident at the Waste Isolation Pilot Plant near Carlsbad that sent high levels of radiation into a salt mine half a mile (0.8 km) below ground where nuclear waste is stored suggested the culprit...