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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: Activity at North Korea nuke site

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Officials: Activity at North Korea nuke site

US spy satellites have detected new activity at North Korea's underground nuclear test site for the first time in several weeks, two US officials told CNN.

Officials: Activity at North Korea nuke site

US spy satellites have detected new activity at North Korea's underground nuclear test site for the first time in several weeks, two US officials told CNN.