The Kosovo Liberation Army (KLA) abducted civilians in Kosovo who were then mistreated and in some cases killed, a BBC investigation has found.

Sources told the BBC that Kosovo Serbs, ethnic Albanians and gypsies were among an estimated 2,000 who went missing.

This took place both during and after the war in Kosovo, which ended in June 1999.

Kosovo Prime Minister Hashim Thaci, the former KLA political director, has rejected the allegations.

The BBC News investigation also studies claims that some of those held in Albania were killed for their organs, and that physical evidence gathered by UN investigators in Albania was destroyed by the International War Crimes Tribunal.