North Korea announced its underground nuclear test a little more than an hour after the U.S. Geological Survey reported a magnitude 4.7 seismic disturbance at the site of North Korea's first nuclear test.
There was no immediate information on the yield of the weapon used in Monday's test. The Russian Defense Ministry said the explosion was between 10 to 20 kilotons. The U.S. State Department said it was analyzing the data.
The North's state-run Korean Central News Agency would say only that the latest test was safely conducted "on a new higher level in terms of its explosive power and technology of its control."
U.S. intelligence estimated that the first North Korean test -- in October 2006 -- produced an explosion equal to less than 1,000 tons of TNT. The low yield was a fraction of the size of the bombs the United States dropped on Japan at the end of World War II.
Intelligence analysts had predicted North Korea would conduct a second rocket or nuclear test.
IMO, its at least partially another ploy to gain more concessions at the negotiation table. Will be interesting to see if the administration gives in.