Report: North Korea conducts nuke test

[Preechr]

SEOUL, South Korea - South Korean government officials said North Korea performed its first-ever nuclear weapons test Monday, the South's Yonhap news agency reported.

South Korean officials could not immediately confirm the report.

South Korean President Roh Moo-hyun convened an urgent meeting of security advisers over the issue, Yonhap reported.

The North said last week it would conduct a nuclear test as part of its deterrent against a possible U.S. invasion.

The director of South Korea's monitoring center that is watching for a test with sound and seismic detectors declined to immediately comment on the report. The U.S. Geological Survey said it had detected no seismic activity in North Korea, although it was not clear whether a blast would be strong enough for its sensors.