The number of people dead or missing as a result of the cyclone that struck Burma at the weekend was likely to exceed 100,000, the US said on Wednesday night.
Video: Burma water
Surivors face a new struggle for water in the aftermath of the cyclone
A senior US official said the administration had been told of the likely toll but warned that any efforts to accurately estimate the number of casualties was complicated by the fact that Burma had not compiled a census for seven decades.
But the UN still awaits military permission for 40 disaster relief experts to bring emergency aid to remote areas where it is most needed.