For nearly a month torrential monsoon rains have triggered massive floods, moving steadily from north to south in Pakistan, affecting a fifth of the volatile country and 17 million of its 167 million people.

Southern Sindh is the worst-affected province. Out of its 23 districts, 19 have so far been ravaged by floods, a statement by the United Nations' Office for the Coordination of Humanitarian Affairs (OCHA) said Friday.

"More than seven million people have been displaced in Sindh since August 3, one million only in the past two days," provincial relief commissioner Ghulam Ali Pasha told AFP.

"The magnitude of this catastrophe is so huge that the government cannot cope with it alone. We are trying to grapple it, but we need international support," he said.

Pasha said 2.3 million people were still in need of tents and food.

"We are fighting to save Thatta and other towns," in Sindh, he added.

Other officials said floods were moving swiftly towards Thatta district and had begun submerging the district's outskirts.

"Two more breaches have taken place around Thatta. We are trying to save the city, (but) Belo has been submerged in water," Hadi Bakhsh Kalhoro, a senior administrative official, told AFP.

Belo, on the outskirts of Thatta, has a population of around 10,000 people.

Thatta was deserted as people fled with their livestock and other belongings, heading for nearby Makli and Karachi as engineers tried to repair six-metre (20-foot) wide breach a nearby dyke, an AFP reporter said.

Hundreds of people including women and children, some bare footed and some in torn clothes have blocked the national highway near Makli neighbourhood of Thatta.

Flood victims blocked the highway by placing stones and other hurdles on the main highway and started protesting, an AFP reporter said.

"We are hungry, we need food, we need water," Mai Safoora, 55 told AFP at site.

"Since two days we are hungry, we found food for only one time in past two days," said Safoora who was accompanied with her four children.

Close to this group of some 300 people, dozens of small groups were seen waiting for help under the open sky while some were trying to take shelter under the trees.

"Me and my mother are searching for food since tomorrow, we are hungry," Abdul Latif, 15, who was running a food stall in Sajawal town told AFP.

"Nobody came here to help us," Latif added.

"The flood situation in southern Sindh continues to deteriorate, large-scale population movements have been reported following the breach of an embankment in Thatta district," an OCHA statement issued late Friday said.

"The Indus River is raging at 40 times its normal volume, with the largest sea surge of water now in the Thatta district," it said.

Sindh irrigation minister Jam Saifullah Dharejo said they were making all possible efforts to save Thatta district.

"Today is very important for Thatta, we are using all our resources to stop the water flow towards Thatta. We are making gigantic efforts," he told AFP.

Sindh chief minister Syed Qaim Ali Shah warned the city would be in danger until the breach was repaired.

"We are hopeful that we will successfully plug the breach in two to three days, but the danger to Thatta remains," he told reporters Saturday.

United Nations officials said humanitarian workers were increasingly worried about malnutrition and disease among children.

"We must act together to ensure that already malnourished children do not succumb to disease, and to prevent more from becoming malnourished and ill," said Martin Mogwanja, UN humanitarian coordinator in Pakistan.

"We are responding to this threat and must continue to do so. If nothing is done, an estimated 72,000 children, currently affected by severe acute malnutrition in the flood-affected areas, are at high risk of death," he said.

Pakistan's worst humanitarian disaster has left eight million dependent on aid for their survival and has washed away huge swathes of the rich farmland on which the country's struggling economy depends.

The government has confirmed 1,600 people dead and 2,366 injured, but officials warn that millions are at risk from food shortages and disease.

The United Nations has warned that 800,000 people in desperate need of aid had been cut off by the deluge across the country, and has appealed for more helicopters to deliver supplies to those reachable only by air.

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