Concern is growing internationally for the stability of North Korea after the execution of its leader Kim Jong-un's uncle.

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

He was accused of forming factions against the state, corruption and "depraved" acts such as womanising and drug abuse.

It was the biggest upheaval since Mr Kim succeeded his father two years ago.

Lucy Williamson reports.