The confirmation came three hours after seismic activity was detected at North Korea's nuclear test site.
Activity had been observed at the Punggye-ri nuclear test site for several months.
BBC: North Korea nuclear test branded 'serious threat' to US
And Kazakhstan 20 years ago was the first country to close its nuclear test site -- in Semipalatinsk we voluntarily renounced our nuclear arsenal.
On Monday, speculation of a new nuclear-weapons test by Pyongyang was given momentum by a front-page story in a major South Korean daily saying activity at North Korea's nuclear test site in the north of the country had intensified.
On Tuesday, speculation of a new nuclear-weapons test by Pyongyang was given momentum by a front-page story in a major South Korean daily saying activity at North Korea's nuclear test site in the north of the country had intensified.
WSJ: North Korea Suspends Operations at Kaesong Industrial Complex
North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday.
Many Western diplomats and nuclear experts believe the Parchin site has been secretly used to test high-explosive nuclear triggers, an essential step toward achieving a weapons capability.
It is a replica of Chagai, the site of Pakistan's nuclear test last year.
And about 500 nuclear tests have been carried out on this test site, 70 of them in the open air.
It has been 10 years this week since the last U.S. nuclear test shook the ground at the Nevada Test Site.
South Korean officials have said that activity at the Punggye-ri site indicates preparations for another nuclear test after North Korea exploded a nuclear device there on Feb. 12.
For several weeks South Korean officials have said that activity at the Punggye-ri site indicates preparations for another nuclear test after North Korea exploded a nuclear device there on Feb. 12.
WSJ: North Korea Suspends Operations at Kaesong Industrial Complex
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