The Democratic People’s Republic of Korea (DPRK) claimed on 25 May 2009 that it has conducted a nuclear test. CTBTO Executive Secretary Tibor Tóth has deplored the DPRK’s action as “a serious violation of the norm established by the Comprehensive Nuclear-Test-Ban Treaty (CTBT) and as such deserves universal condemnation”. Thirty-nine seismic stations have registered a signal measuring 4.52 on the Richter scale at 00:54 GMT.

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• UN Security Council, acting unanimously, condemns in strongest terms Democratic People's Republic of Korea nuclear test, toughens sanctions (ISRIA)

• New York, 15 June 2009 - Secretary-General's statement on the urgency of the entry into force of the Comprehensive Nuclear-Test-Ban Treaty (UN)
  
  
• Ban deplores DPR Korea's underground nuclear test

• US confirms N Korea nuclear test (BBC)
  
  
• 'Pyongyang preparing for third nuke test' (Korea Herald)
  
  
• North Koreans have made nuclear progress, experts say (CNN)
  
  
• Time running out as UN inches towards confirming North Korea test (Earth Times)
  
  
• North Korea's Curious Nuclear Test (Science Insider)
  
  
• No noble gas from North Korea blast (BBC)
  
  
• Factbox: Reaction to N Korea's nuclear test (TVNZ)
  
  
• The Test Ban Treaty (Editorial, NY Times)
  

• Obama condemns N Korea for nuclear test blast (Scotsman)