Asia
19 December 2011 Last updated at 04:31 GMT N Korean leader Kim Jong-il dies
The announcer, wearing black, made the emotional announcement on state-run television
North Korean leader Kim Jong-il has died at the age of 69, state-run television has announced.
Mr Kim, who has led the communist nation since the death of his father in 1994, died on a train while visiting an area outside the capital, the announcement said. He suffered a stroke in 2008 and was absent from public view for months.
His designated successor is believed to be his third son, Kim Jong-un, who is thought to be in his late 20s.
"All party members, military men and the public should faithfully follow the leadership of comrade Kim Jong-un and protect and further strengthen the unified front of the party, military and the public," the news agency said.
A funeral for Kim Jong-il will be held in Pyongyang on 28 December and Kim Jong-un will head the funeral committee, KCNA said. A period of national mourning has been declared from 17 to 29 December.
The BBC's Lucy Williamson in Seoul says Mr Kim's death will cause huge shock waves across North Korea, an impoverished, nuclear-armed nation with few allies.
The announcement came in an emotional statement read out on national television.
The announcer, wearing black, said he had died of physical and mental over-work. A later report from KCNA said Mr Kim had had a heart attack.
South Korea's military has been put on alert following the announcement and its National Security Council is convening for an emergency meeting, Yonhap news agency reports. The White House said it was "closely monitoring" reports of the death.
Asian stock markets fell after the news was announced.
Mr Kim had been making preparations to further install his son as his successor - a process that many had expected to see significant consolidation in 2012. Professor Lee Jung-hoon, professor of international relations at Yonsei University in Seoul, told the BBC that with the transition of power from father to son incomplete, Mr Kim's death could herald "very unstable times" in North Korea.
"We have to be very worried because whenever there is domestic instability North Korea likes to find an external situation to divert the attention away from that - including indulging in provocation."
Analysis
He died, she said, of a heart attack brought on by mental and physical fatigue. Kim Jong-il had battled serious health problems for many years but his death has come more quickly than many expected.
His apparent heir, his son Kim Jong-un, has been groomed as the successor of the nuclear armed state for little more than a year.
The question now is whether he has the power and authority to fill his father's shoes.
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