FLASH TRAFFIC!

As of 12:04 A.M., Monday October 9th, 2006, North Korea has apparently successfully tested a nuclear device.

CNN

This is not good.

UPDATE:

It now appears that the test was a 'fizzle.' This occurs when the chain reaction in the plutonium-239 (or uranium-235, but usually plutonium) is incomplete. The result is a smaller explosion than intended, but still much more powerful than any conventional explosive and with all the usual nastiness of radiation, EMP and fallout.