North Korea has ability to produce at least 10 nuclear weapons...

A South Korean nuclear expert says North Korea is estimated to have enough plutonium and highly enriched uranium to produce at least ten nuclear weapons. The expert, who requested anonymity, said Wednesday that the North is assessed to have more than 40 kilograms of plutonium. He said the plutonium has been acquired through at least three reprocessing efforts since 2003. Given that it takes around six kilograms of plutonium to produce one nuclear weapon, the North currently has the ability to produce six to seven nuclear arms. The expert also said the North is regarded to have 60 kilograms of highly enriched uranium, which is enough to produce three to four nuclear weapons.
(KBS World Radio, 2012-05-03)

Report: North Korea ready for nuclear test...

A Japanese television broadcaster said North Korea has completed preparations for another nuclear test.

Japan’s Fuji Television cited a Japanese government official as saying all external preparations were seen to be completed for North Korea to conduct a third nuclear test, and that it would not be unusual for Pyongyang to conduct such a test at any time.

The broadcaster said the move prompted Japan and the U.S. to step up alert for possible nuclear detonation by the North.

Earlier this month, a South Korean intelligence source said an additional shaft had been discovered aside from the two tunnels dug for previous nuclear tests the North conducted in Punggye-ri, and that construction there was observed to be coming to an end.

North Korea has already conducted two nuclear tests, one in October 2006 and the other in May 2009.
(KBS World Radio, 2012-04-23)

North Korea suspected of preparing nuclear test...

South Korea says North Korea is preparing for its third nuclear test. South Korean intelligence authorities analyzed an image taken on April 1st by a US commercial satellite. The image shows a new tunnel at a nuclear test site in Poongkye-ri, North Hamkyong Province, in the northeast of the country. The South Koreans said that the North is digging the ditch for another nuclear test. The tunnel is south of the ones used in nuclear tests in 2006 and 2009. Since last month dirt has been accumulating at the entrance of the new pit. A South Korean expert says the North usually fills the tunnels with dirt when it conducts nuclear tests to measure the effect of the explosion and to keep nuclear substances inside. North Korea conducted its past two nuclear tests within three months of its long-range ballistic missile launches. The country says it will launch a rocket carrying a satellite between April 12th and 16th. The South Korean government says the North is highly likely to carry out a nuclear test, as a reaction to international criticism, following the planned launch.
(Japan Broadcasting Corporation, 2012-04-09)