New torrents of flood water inundated more towns and villages in Pakistan on Sunday as the millions of people made homeless by the disaster grew increasingly desperate.UN Secretary-General Ban Ki-moon said he had never seen a disaster as bad, and urged foreign donors to speed up assistance to the 20 million people the government says have been affected.Flood surges coursed down the River Indus and other waterways in Pakistan's southern Sindh province on Sunday, sweeping through hundreds more villages, authorities said.In the province's city of Jacobabad, the Pakistani army continued helicopter flights to rescue people stranded by the rising water.In western Punjab province, the army used boats to rescue residents of Pathan Gharr village, who said they had been trapped by the floods for six days.Pakistan's worst ever floods have killed about 1,500 people and damaged 7.9 million acres (3.2 million hectares) of cotton, sugar cane and wheat crops.

Local charities and international agencies have helped hundreds of thousands of people with food, water, shelter and medical treatment, but the scale of the disaster has meant that many millions have received little or no assistance.In Charsadda, a town in northwestern Khyber Pakhtunkhwa province, the medical aid charity Medecins Sans Frontieres (Doctors Without Borders) distributed clean water to residents on Saturday.