Yonhapreported earlier that North Korea has completed preparations for another nuclear test, claiming the North may use a previously unused tunnel at its mountainous test site.
The blast is estimated to have had the explosive power of 10 kilotons, analysts have said, which makes this the most powerful nuclear detonation in Punggye-ri, the area of North Korea's underground test site. It added South Korea and US intelligence officials believed there was a "high" probability the reclusive regime's sixth nuclear blast to date could come before year-end.
North Korea has dismissed as "laughable" moves by the United States to impose fresh sanctions following its fifth nuclear test.
"We will continue to take measures for increasing the nuclear force of the country in quality and quantity to ensure genuine peace from the United States increasing threat of a nuclear war", it added.
South Korea has threatened to reduce North Korea to ashes and "remove it from the map" if it shows any signs of mounting a nuclear attack, the BBC reports.
Before it's here, it's on the Bloomberg Terminal. The year 2016 became the first time NDRK has conducted two nuclear tests in the same year.
In a statement, the Ministry of Foreign Affairs said it "condemns in the strongest possible terms the latest nuclear test that was carried today by the Democratic People's Republic of Korea".
Pyongyang's robust response comes two days after the secretive communist state - which has been subject to sanctions since 2006 - carried out its fifth and biggest atomic test in defiance of United Nations sanctions.