Beijing: Flooding and poor harvests have caused North Korea's worst food crisis since the late 1990s and have put millions at risk, the United Nations' food body said on Wednesday.

The World Food Programme said North Korea's food shortage has worsened this year after floods in 2007, followed by poor harvests, leading to the threat of widespread malnutrition.

"Millions of vulnerable North Koreans are at risk of slipping toward precarious hunger levels. The last time hunger was so deep and so widespread in parts of the country was in the late 1990s," Jean-Pierre de Margerie, the WFP's country director for North Korea, told a news conference.

The WFP had been given permission to launch a new operation to target those most vulnerable in eight of the country's 10 provinces, or 6.4 million people, up from a current 1.2 million. An international appeal for aid would be launched in the next two weeks.

While 400,000 metric tonnes of US food aid have already shipped, there is an urgent need for $20 million (Dh73.5 million) to get through the next autumn harvest, De Margerie said.

"We are running against the clock here," he said.

The North has resorted to outside handouts to help feed its 23 million people since the mid-1990s when natural disasters and mismanagement devastated its centrally controlled economy. But outside aid has fallen this year, De Margerie said, compounded by domestic shortfalls.

The amount of food given in government rations to urban dwellers has fallen in the last few months, as prices for staple goods have risen dramatically due to less internal transfers of food. Rice now costs three times more than it did a year ago, he said, and maize prices have quadrupled.