TOKYO (Sputnik) — On Wednesday, Pyongyang announced that it had carried out the first test of a hydrogen bomb. The international community doubts the North Korea's claim that its nuclear test was of a hydrogen bomb.
6 January 2016, 14:27 GMT
According to the Yonhap news agency, the South Korean experts' analysis of the air revealed very low concentrations of xenon which is produced during fission of uranium nuclei.
The experts stressed that they were still to determine whether the presence of the gas is linked to the suspected test or other factors.
North Korea declared itself a nuclear power in 2005 and conducted nuclear tests in 2006, 2009 and 2013, having earlier withdrawn from the Nuclear Non-Proliferation Treaty that it ratified in 1985.
