North Korea conducts third nuclear test successfully

North Korea has conducted the third under ground  nuclear test successfully on 12 February 2013 after weeks of threats . The State-run Korean Central News Agency (KCNA) said a “miniaturised” nuclear device had been  detonated successfully at the test site.The detonation caused a tremor with a magnitude of between 4.9 and 5.1, sending shock-waves through the Korean peninsula.