Report: North Korea conducts nuclear weapons test

North Korea performed its first-ever nuclear weapons test Monday, Yonhap news agency reported, citing government officials. South Korean officials couldn't immediately confirm the report. South Korean President Roh Moo-hyun has convened a 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 US invasion.