PYONGYANG, North Korea — North Koreans marched by the thousands Monday to their capital's landmarks to mourn Kim Jong Il, many crying uncontrollably and flailing their arms in grief over the death of their "Dear Leader."
North Korean state media proclaimed his youngest son, Kim Jong Un, a "Great Successor," while a vigilant world watched for any signs of a turbulent transition to the untested leader in an unpredictable nation known to be pursuing nuclear weapons.
South Korea's military went on high alert in the face of the North's 1.2 million-strong armed forces following news of Kim's death after 17 years in power. North Korea said Kim died of a heart attack on Saturday while carrying out official duties on a train trip. President Barack Obama agreed by phone with South Korean President Lee Myung-bak to closely monitor developments.
On the streets of the North Korean capital, Pyongyang, people wailed in grief, some kneeling on the ground or bowing repeatedly. Children and adults laid flowers at key memorials.
A tearful Kim Yong Ho said Kim Jong Il had made people's lives happier. "That is what he was doing when he died: working, traveling on a train," he said.
Other North Koreans walked past a giant painting of Kim Jong Il and his late father, national founder Kim Il Sung, standing together on Mount Paektu, Kim Jong Il's official birthplace. Wreaths were neatly placed below the painting.
"How could the heavens be so cruel? Please come back, general. We cannot believe you're gone," Hong Son Ok shouted, her body shaking wildly during an interview with North Korea's official television.
A foreigner who teaches at a university in Pyongyang told The Associated Press that students told about Kim's death looked very serious but didn't show any outward emotion.
"There was a blanket of silence," said the teacher, who spoke on condition of anonymity because of worries about his security. "People were going about their business. Lots of people were lining up to lay flowers at official portraits. People looked a little stunned and very serious, but composed and respectful."
"He passed away too suddenly to our profound regret," said a statement carried by the North's official Korean Central News Agency. "The heart of Kim Jong Il stopped beating, but his noble and august name and benevolent image will always be remembered by our army and people."
He was 69, according to official records, though some reports indicate he was 70.
North Korean state media fell short of calling Kim Jong Un the country's next leader, but gave clear indications that Kim Jong Il's third son, who is believed to be in his late 20s, would succeed his father.
The North said in a dispatch that the people and the military "have pledged to uphold the leadership of comrade Kim Jong Un" and called him a "Great Successor" of the country's revolutionary philosophy of juche, or self reliance.
The death could set back efforts by the United States and others to get Pyongyang to abandon its nuclear weapons ambitions, because the untested successor may seek to avoid any perceived weakness as he moves to consolidate control.
"The situation could become extremely volatile. What the North Korean military does in the next 24-48 hours will be decisive," said Bill Richardson, a former U.S. ambassador to the United Nations who has made several high-profile visits to North Korea.
The death comes at a sensitive time for North Korea as it prepares for next year's 100th anniversary of the birth of Kim Il Sung. The preparations include massive construction projects throughout the city as part of Kim Jong Il's unfulfilled promise to bring prosperity to his people.
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