From left to right: Kim Il-sung, Kim Jong-il and the man believed to be Kim Jong-un
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North Korea's Kim Jong-il looks to family succession

The youngest son of North Korean leader Kim Jong-il has been appointed to two key party posts, in a move widely seen as part of a gradual transfer of power.

Kim Jong-un was named vice-chairman of the Central Military Commission of the Workers' Party and was appointed to its central committee, state media said.

The BBC's John Simpson reports from neighbouring South Korea.

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