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The North Korean national flag flutters at half mast at the North Korea embassy in Singapore on December 20, 2011.  North Korean leader Kim Jong-Il has died aged 69 of a heart attack, state media announced, plunging the nuclear-armed and deeply isolated nation into a second dynastic succession.       AFP PHOTO / SIMIN WANG (Photo credit should read SIMIN WANG/AFP/Getty Images)
The North Korean national flag flutters at half mast at the North Korea embassy in Singapore on December 20, 2011.  North Korean leader Kim Jong-Il has died aged 69 of a heart attack, state media announced, plunging the nuclear-armed and deeply isolated nation into a second dynastic succession.       AFP PHOTO / SIMIN WANG (Photo credit should read SIMIN WANG/AFP/Getty Images)

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    Officials: new activity at North Korean nuke site

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Officials: new activity at North Korean nuke site

U.S. spy satellites have recently detected new activity at North Korea's underground nuclear test site. CNN's Barbara Starr reports.

Officials: new activity at North Korean nuke site

U.S. spy satellites have recently detected new activity at North Korea's underground nuclear test site. CNN's Barbara Starr reports.