Berlin/Rome:  Serb prisoners had their internal organs removed and sold by ethnic Albanians during the Kosovo war, according to allegations in a new book by the world's best known war crimes prosecutor.

Carla Del Ponte, who stepped down in January as chief prosecutor at the Hague tribunal for crimes committed in the Balkan wars of the 1990s, said investigators found a house suspected of being a laboratory for the illegal trade.

A senior adviser to Hashim Thaci, Kosovo's prime minister and a leading member of the Kosovo Liberation Army which is accused of benefiting from the trade, denied the allegations on Thursday.

"These are horrible things even to imagine," said Bekim Collaku. "But this is a product of her ODel Ponte's] imagination."

Del Ponte reports that the allegations were made by several sources, one of whom "personally made an organ delivery" to an Albanian airport for transport abroad, and "confirmed information directly gathered by the tribunal".

Sewn up

According to the sources, senior figures in the Kosovo Liberation Army were aware of the scheme, in which hundreds of young Serbs were allegedly taken by truck from Kosovo to northern Albania where their organs were removed. Del Ponte provides grim details of the alleged organ harvesting, and of how some prisoners were sewn up after having kidneys removed.

"The victims, deprived of a kidney, were then locked up again, inside the barracks, until the moment they were killed for other vital organs. In this way, the other prisoners were aware of the fate that awaited them and,l according to the source, pleaded, terrified, to be killed immediately," Del Ponte writes.

The claims in The Hunt: Me and War Criminals have renewed tensions between Serbia and its former province of Kosovo, which declared independence two months ago.

In it, the Swiss ex-prosecutor reveals how her efforts to bring alleged war criminals to justice were stymied by lack of co-operation from all sides - Serb, Albanian and even Nato.

Vladan Batic, Serbia's former justice minister, said: "If her allegations are true, then this is the most monstrous crime since the times of Mengele, and it must be made a priority, not only of the domestic judiciary, but also of the Hague Tribunal."

- The Telegraph Group Limited, London 2008