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N Korea: 'News comes as a shock to us in South Korea'

13 December 2013 Last updated at 05:03 GMT

The once-powerful uncle of North Korean leader Kim Jong-un has been executed after being purged for corruption, state news agency KCNA reports.

Chang Song-thaek was dramatically removed from a Communist Party session by armed guards earlier this week.

Professor Jung-Hoon Lee told BBC News that the news "comes as a shock".