The Obama Diplomacy at Work - BOOOOOM!

2114 Local NM Time via Fox News - News that North Korea may have successfully tested another nuclear weapon!

Here's the Wall Street Journal: South Korea: Possible Nuclear Test Detected in North Korea

SEOUL – South Korea defense monitors detected an "artificial earthquake" in a region of North Korea on Monday morning and senior government leaders suspect it may have been a test of a nuclear device, a representative of South Korea's presidential office said.

The seismic reading, amounting to 4.5 on the Richter scale, was centered in the same county and province as the place where North Korea tested its first nuclear device in October 2006, the representative said. South Korean military and defense officials were trying to determine more deals.

North Korea several weeks ago issued a statement saying it was considering making a second test of a nuclear device. - MAY 24, 2009, 11:10 P.M. ET

Via NYTimes online:

SEOUL, May 25 (Reuters) - North Korea said it had successfully conducted a nuclear test on Monday, raising the explosive power and level of control of its nuclear device to a new level, its state media said.

"We have successfully conducted another nuclear test on May 25 as part of the republic's measures to strengthen its nuclear deterrent," the North's official KCNA news agency said. - Filed at 11:10 p.m. ET

Update: According to Reuters via the Washington Post the test was conducted at 0054 GMT (2054 ET).

Second Update: If my gonculations are correct then the yield based on a measured magnitude of 4.5 to 4.7 gives 5.6 to 11.2KT.