North Korea is believed to possess up to two tonnes of highly enriched uranium, South Korea's unification minister said Thursday.
"Intelligence agencies estimate Pyongyang's stockpile of highly enriched uranium - more than 90 percent pure - at up to 2,000 kilogrammes," South Korea's unification minister Chung Dong-young told reporters.
"Even at this very hour, North Korea's uranium centrifuges are operating at four sites," he added.
