South Korea's nuclear safety agency said on Friday that it detected the presence of a miniscule amount of xenon gas following North Korea's nuclear test on Wednesday.
More analysis and the collection of more samples were needed to determine whether the xenon particles came from the North's nuclear test, it said. The amount detected does not significantly exceed levels that would ordinarily be present.
The presence of xenon would not indicate whether the blast was from a hydrogen bomb, experts have said. Many governments and experts doubt that the North's claim of its nuclear test was a hydrogen bomb.
On Wednesday, North Korea announced a test of a miniaturised hydrogen nuclear device had been successfully accomplished and highlighted a significant improvement in the isolated state's strike power.
The incident caused regression in Japan and South Korea.
Thus, North Korea carried out fourth nuclear test. Before that, It had conducted three nuclear tests between 2006 and 2013, drawing international condemnation. China joined the UN Security Council in a sanctions resolution after the 2013 test.
UN Security Council has imposed sanctions to North Korea because of its nuclear weapons program since it first tested an atomic device in 2006.
A Western diplomat stated that if the last Pyongyang nuclear test was confirmed, the UNSC members would quite likely to expand the current UN sanctions against North Korea.