Seoul, May 25 North Korea has tested a nuclear detonation device apparently in preparation for its seventh nuclear test, a Presidential official said on Wednesday.
South Korea does not believe a nuclear test will happen in the next day or two, but it could "certainly" take place after that, Kim Tae-hyo, First Deputy Director of the National Security Office, told reporters.
North Korea is believed to be preparing for its first nuclear test in nearly five years at its Punggye-ri nuclear test site, Yonhap news agency reported.
Earlier on Wednesday, the country launched three ballistic missiles, including a presumed intercontinental ballistic missile.
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