THATTA (AFP) Hundreds of thousands of people were fleeing areas in Sindh on Saturday as rising floodwaters breached more defences and inundated towns. 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. 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 districts 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 wide breach a nearby dyke, an AFP reporter said. The flood situation in 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.