N Korea successfully conducsts a nuclear test

North Korea has successfully Conducted an underground nuclear test.

The news confirms earlier reports by South Korea's Yonhap news agency.

South Korean President Lee Myung-bak is reported to have convened an emergency security meeting.

Yonhap quoted an unnamed official from South Korea's ruling party.

Both South Korea's and the US geological agency said they detected a seismic tremor early on Monday that indicated a nuclear explosion.