An estimated 20 million people are now affected by the floods in Pakistan – that is almost three times the population of Greater London.
At an emergency meeting of the UN in New York, the US and EU led a stream of pledges of more funds.
Secretary General Ban ki-Moon did not mince his words: “Pakistan is facing a slow-motion tsunami. Its destructive power will accumulate and grow with time. International humanitarian organisations are straining every muscle to deliver. But they need massive additional support.”
More than four million people have been left homeless by the floods. Shelter, food and clean water are desperately needed to avert a humanitarian catastrophe.
Pakistan plans to clamp down on charities with links to islamist militants who are trying to exploit desperation and anger among flood victims.