Authorities seized a small amount of radioactive material and nerve gas from a taxi in the Georgian capital and detained the driver, officials said Monday. Tedo Mokeliya was detained May 31 after police in this former Soviet republic discovered two containers with 3 curies of cesium-137 and 12 microcuries of strontium in his taxi, said Givi Mgebrishvili, chief of the Interior Ministry's main criminal investigation department. Cesium and strontium, which have medical and industrial applications, are considered likely ingredients for a so-called "dirty bomb," in which conventional explosives are combined with radioactive material. Mgebrishvili said at a news conference that...