S. Korea warns North against nuclear test
South Korean President Ee Myung-Bak held an emergency security meeting that warned North Korea of "serious consequences" if it went through with an expected nuclear test.
The meeting at the presidential Blue House included the defence minister, National Intelligence Service chief and the national security advisor.
A statement issued afterwards said Mr Ee had insisted on a strengthened defence posture.
North Korea has threatened to carry out its third nuclear test in response to UN sanctions imposed on Pyongyang for its long-range rocket launch in December.