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North Koreans are in mourning after the death of their dear leader, Kim Jong-il.

People wept openly on the streets of the capital, Pyongyang. State media said he had suffered a heart attack on Saturday, aged 69. He had been unwell.

The official news agency KCNA described one of his sons, Kim Jong-un, as the "great successor" whom North Koreans should unite behind.

Pyongyang's neighbours are on alert fearing instability in the poor and isolated nuclear-armed nation.