'Multiple' N Korea tests warning

South Korea's outgoing leader, Lee Myung-bak, has warned that North Korea could be planning more than one nuclear test, even as the US spoke of consequences if it went ahead.

Lee Myung-bak, who leaves office this month, told Choson Ilbo newspaper that Pyongyang could be planning "multiple nuclear tests at two places or more".

North Korea said in January it was planning a "high-level nuclear test".

The BBC's Seoul correspondent Lucy Williamson was at the conference.