Pakistan's humanitarian crisis is the largest "in decades" The UN in Pakistan has described the humanitarian situation caused by the flood disaster as critical.
As flood waters continue to travel south through the country, tens of thousands of people are being displaced each day.
Earlier, the UN said it had raised some 70% of the money needed to provide emergency relief to flood victims.
The International Monetary Fund is in talks with Pakistan to discuss how to help deal with the crisis.
The IMF says the floods pose a "massive economic challenge" and it will review the country's budget and financial prospects in light of its ongoing $11bn loan package.
The UN now estimates that the number of people who need basic shelter has gone from two million to six million.
Nearly 17 million people have been affected by the floods.
This week marks a month since the flooding started, and although the United Nations says it has raised close to 70% of the $460m (295m) needed to provide emergency relief, many people have yet to receive any help, says the BBC's Jill McGivering in Sindh, the country's worst affected province.
Some $54m of that money is in uncommitted pledges. Resources available now total $263m.
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Kumkum Bhagya
