South Korea confirms traces of radioactive gas from North Korea's nuclear test

FILE PHOTO: North Korean leader Kim Jong Un signs a document regarding the test of a hydrogen bomb, in this still image taken from KRT video and released by Yonhap on January 6, 2016. REUTERS/Yonhap/File Photo

SEOUL (Reuters) - 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.

North Korea conducted its sixth nuclear test on Sept. 3, prompting the U.N. Security Council to step up sanctions with a ban on the reclusive regime's textile exports and a cap on fuel supplies.