During the Kosovo War thousands of Kosovo Albanian women and girls became victims of sexual violence. War rape was used as a weapon of war and an instrument of systematic ethnic cleansing; rape was used to terrorize the civilian population, extort money from families, and force people to flee their homes. According to a report by the Human Rights Watch group in 2000, rape in the Kosovo War can generally be subdivided into three categories: rapes in women's homes, rapes during flight, and rapes in detention. The majority of the perpetrators were Serbian paramilitaries, but also included Serbian special police or Yugoslav army soldiers. Virtually all of the sexual assaults Human Rights Watch documented were gang rapes involving at least two perpetrators. Since the end of the war, rapes of Serbian, Albanian, and Roma women by ethnic Albanians — sometimes by members of the Kosovo Liberation Army (KLA) – have been documented, although not on a similar scale. Rapes occurred frequently in the presence, and with the acquiescence, of military officers. Soldiers, police, and paramilitaries often raped their victims in the full view of numerous witnesses.