Rohingyas have said their homes were set on fire and people shot, slashed or burned to death. "This is the fastest growing refugee crisis in the past five years, with serious human rights concerns," a UNHCR spokesman said.
Chris Lom, a UN aid worker in Cox's Bazar, on the front line of the humanitarian disaster, said people were "very vulnerable, traumatised," while relief agencies struggled.
"UN agencies and the government were expecting the possibility that as many as 100,000 more people could come across when there were already 600,000 Rohingyas in Bangladesh," he told UN News.
"But I don't think anyone expected a mass exodus like this, unprecedented in terms of value and speed," he said.
Yesterday, one Red Cross mobile medical team at the makeshift Balukhali camp managed to treat 100 people suffering from diarrhoea, old bullet wounds and burns before supplies ran out.
Isolated rural locations and throngs of displaced people present major obstacles to aid supply. Increasingly desperate refugees, weak from hunger, are clambering onto the few trucks that do get through, trying to claim whatever supplies they can, causing fights to break out.
Aid that arrived by air earlier this week would not cover a tenth of refugee needs, officials have said, estimating the relief effort would cost at least US$77 million.