North Korea conducted its sixth nuclear test on Sept. 3, prompting theUN Security Council to step up sanctions with a ban on the reclusive regime's textile exports and a cap on fuel imports. Read more.
South Korea detects radioactive gas from North Korea bomb test
South Korea said on Wednesday traces of radioactive xenon gas were confirmed to be from a North Korean nuclear test earlier this month, but it was unable to conclude whether the test had been for a hydrogen bomb as Pyongyang claimed.