SARAJEVO: "Sarajevo never had an ethnic majority, and today it is definetely dominated by one group, not only in terms of demographics but also politically," reports TIME's Massimo Calabresi from the city. After almost four years of war, the last of five Serb-held areas came under the control of the Muslim-Croat Federation Tuesday. Following days of looting, arson and reported rape by angry Serbs, 100 Federation police moved into the Serb suburb of Grbavica. Hours before, departing Serbs had tossed grenades and set buildings ablaze before fleeing. The mixed Federation police force -- 75 Muslims, 20 Serbs and five Croats -- now patrol the district. "Recently, between 50,000 and 60,000 Serbs have fled and only 11,000 remain," says Calabresi. He also reports that there are serious difficulties in the Muslim-Croat Federation. "There are underlying political problems, including disagreement over ways in which Bosnia can be reunified," says Calabresi. "The Dayton accords stipulate a very optimistic timetable for reunification, but neither the Serb Republic nor the Muslim-Croat Federation seem to be showing any real capacity to create one country. Sarajevo over the past four weeks has been a clear example of that."