From left to right: Kim Il-sung, Kim Jong-il and the man believed to be Kim Jong-un
Media playback is unsupported on your device
Video

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.

Go to next video: Tales of starvation in North Korea