The chief of the United Nations' refugee agency has called for increased support for the more than 430,000 Rohingya Muslims who are sheltered in Bangladesh after having fled sectarian violence in neighbouring Myanmar. "Their situation remains desperate, and we risk a dramatic deterioration if aid is not rapidly stepped up," Filippo Grandi, the UN's High Commission for Refugees, said in Dhaka on Monday. According to dpa, Grandi made the comments after his two-day visit to the district of Cox's Bazar in south-east Bangladesh, where refugees have been living in tents or out in the open since their arrival. According to UN estimates, 436,000 Rohingya Muslims have fled Buddhist-majority Myanmar since August 25, when entire villages were destroyed in Myanmar's Rakhine State as part of a military crackdown.