2009 North Korean nuclear test was the underground detonation of a nuclear device conducted on Monday , 25 May 2009 by the Democratic People 's Republic of Korea . This was its second nuclear test , the first test having taken place in October 2006 . Following the nuclear test , Pyongyang also conducted several missile tests . A scientific paper later estimated the yield as 2.35 kilotons
first test
2006 North Korean nuclear test
2009 North Korean nuclear test