South Korean media are reporting North Korea may have carried out an underground nuclear test. If confirmed, it would be the country's 6th nuclear test.
Japanese Prime Minister Shinzo Abe has told reporters that it is not acceptable if North Korea has conducted a nuclear test. The prime minister said he ordered relevant ministries to analyze information and inform the public

เกิดแรงสั่นสะเทือนระดับ 5.6 magnitude "artificial earthquake" เมื่อเวลา 12:20 (เวลาที่เกาหลี) บริเวณ the Punggye-ri area

http://english.yonhapnews.co.kr/northkorea/2017/09/03/0401000000AEN20170903001357315.html