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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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Why does North Korea detain some US citizens?

North Korea has detained a number of US citizens in recent years. CNN's Ivan Watson looks at why.

Why does North Korea detain some US citizens?

North Korea has detained a number of US citizens in recent years. CNN's Ivan Watson looks at why.