The United Nations refugee agency today evacuated most of its staff from its office in a town in eastern Chad after a series of armed attacks this week on the agency and other aid organizations operating in the troubled region. Five vehicles belonging to the UN High Commissioner for Refugees (UNHCR), its non-governmental partners and Médecins Sans Frontières Suisse have been stolen at gunpoint in the past 72 hours, while the UNHCR compound in Guereda was entered by armed men on two nights this week.