United Nations, April 19, SPA -- The acting head of the UN refugee agency, Wendy Chamberlin, is due to begin a visit to the conflict-torn Darfur region in western Sudan. The UNHCR said she would meet UN staff and other aid organizations, and visit camps for displaced people in Darfur and in neighboring Chad. Ms Chamberlin's five-day visit comes as the International Committee of the Red Cross expressed concern about increasing attacks on aid workers in Darfur. "These attacks against humanitarian convoys are hampering the humanitarian activities that are taking place in Darfur," said ICRC spokesman Marco Jimenez. Banditry rather than politics appears to be the main motive, BBC quoted the spokesman as saying.--SPA1135 Local Time 0835 GMT www.spa.gov.sa/255777