The government of Serbia claims there are around 250,000. refugees and internally displaced persons (IDPs) from Kosovo, the vast majority of whom are Serbs, who still do not feel safe returning to their homes. Amongst other things, according to SC Resolution 1244, Serbia is authorised to send a specific amount of its troops back into Kosovo. The UNMIK so far has prevented Serbia from doing so, thus in fact breaching the resolution. Since the establishment of the United Nations Mission in Kosovo (UNMIK) in 1999, according to some international organizations Kosovo has become a major destination country for women and young girls trafficked into forced prostitution. There have also been allegations that the presence of UN/NATO peacekeeping troops helps "fuel the sex trafficking trade." According to Amnesty International, most of these women are trafficked from Moldova, Romania, Bulgaria and Ukraine. On 10 February 2007 UN police fired rubber bullets at unarmed demonstrators in Pristina, killing two and injuring 82. The Chief Constable resigned; however, the police unit that fired the rubber bullets returned to Romania, where it has not been investigated. Meanwhile, in Pristina, UNMIK arrested and detained the demonstration organiser, Albin Kurti of VETËVENDOSJE! (Albanian for self-determination). He remained in detention without trial until July 2007 and was subsequently placed under house arrest. Amnesty International has criticised UNMIK's conduct of his prosecution. In June 2005, a BBC article suggested that the European Roma Rights Centre were to sue UNMIK over the treatment of Roma refugees. In July 2006, a book, Peace at Any Price: How the World Failed Kosovo, written by two former senior staffers at UNMIK, outlined errors made by the institution between 1999 and 2006. Kosovo final status process 2005 A UN-led political process began in late 2005 to determine Kosovo's future status. Belgrade proposed that Kosovo be highly autonomous and remain a part of Serbia — Belgrade officials repeatedly said that Kosovo's formal independence would be a violation of Serbia's "sovereignty" and therefore contrary to international law and the UN Charter. Representatives of Kosovo's ethnic-Albanian majority asserted that Kosovo must become independent, arguing that the violence of the Milošević years made continued union between Kosovo and Serbia impossible. UN Special Envoy Martti Ahtisaari, a former president of Finland, led the status process with Austrian diplomat Albert Rohan as his deputy. Ahtisaari's office — the UN Office of the Special Envoy for Kosovo (UNOSEK) — was located