UN Secretary General Ban Ki-moon said he was very concerned that the death toll from Typhoon Haiyan appears to be "rising steeply" and has already affected 9.5 million people in the Philippines.
In a statement, the spokesperson for the Secretary-General said:
"The Secretary-General is extremely concerned by the impact of Typhoon Haiyan, one of the largest storms to ever make landfall, which has affected some 9.5 million people in the Philippines and caused widespread destruction and displacement.
"The death toll appears to be rising steeply, as remote areas are reached."
The Philippine president said the death toll from Typhoon Haiyan could be lower than initially thought, but that many areas remain cut off.
Satellite images of the Philippines before and after Typhoon Haiyan struck show how the storm flattened whole communities.
British typhoon survivor says home nearly collapsed on him and his family