This report reveals how the UN Interim Administration Mission in Kosovo (UNMIK), charged with the protection of human rights in Kosovo, signally failed to initiate prompt or thorough investigations when people reported their family members missing in the immediate aftermath of the war. Amnesty International considers that the abductions which took place after the end of the armed conflict in June 1999, were part of a widespread, as well as a systematic, attack on a civilian population and may constitute crimes against humanity and must be investigated as such.