North Korea's next leader led a funeral procession for his father Kim Jong Il through Pyongyang's snow-covered streets.

Footage broadcast today on North Korea's state television showed Kim Jong Un walking at the side of a sedan bearing a massive portrait of Kim Jong Il as it made its way slowly through a cold, grey Pyongyang.

Tens of thousands of mourners stood in the snow as they passed by. Soldiers stood in lines with their heads bowed.

Kim died of a heart attack on December 17.

Kim's youngest son and successor has rapidly gained prominence following his father's death.

Dressed in a dark overcoat, the younger Kim bowed his head slightly against the snow, and raised his right arm in salute.

Walking behind was Jang Song Thaek, Kim Jong Il's brother-in-law and a vice chairman of the powerful National Defence Commission who is expected to play a crucial role in helping Kim Jong Un take power.

Tens of thousands of mourners stood in heavy snow as they passed by. Soldiers stood in lines with their heads bowed.

Kim Jong Il, who led the nation with an iron fist following his father Kim Il Sung's death in 1994, died aged 69, according to state media.

Kim Jong Un is already being hailed as the "supreme leader" of the party, state and army.

A private ceremony is believed to have been held earlier today in the inner sanctum of the Kumsusan Memorial Palace with Kim Jong Un and top military and party officials.

Foreign dignitaries in the city had been asked to gather at a sports stadium shortly before noon to be taken to Kumsusan to see the hearse pass at the start of the funeral procession through Pyongyang.

The young Kim made his public debut just last year with a promotion to four-star general and an appointment as vice chairman of the Central Military Commission of the ruling Workers' Party.

But in the days since his father's death, the campaign to install him as the next leader has been swift, with state media bestowing him with new titles, including "great successor", "supreme leader" and "sagacious leader".

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