North Korea prepares for 2nd nuclear test...

South Korea has detected signs North Korea may be preparing to conduct a second nuclear explosion, after a report said U.S. satellites picked up activity at the site of the country's first test last week.

The South Korean government is aware of the indications of activity, a government official who declined to be identified said today by phone in Seoul when asked about the report from Washington by ABC News.

United Nations Security Council 1718, approved on Oct. 14, demands North Korea refrain from carrying out another nuclear test and return to six-nation talks on ending its atomic weapons program. The U.S. yesterday confirmed the detonation last week was nuclear.

U.S. spy satellites picked up vehicle movements close to the site of North Korea 's nuclear test last week, a sign Kim Jong Il's government may be preparing a second underground blast, ABC reported, citing unidentified U.S. intelligence officials.

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