The United Nations says fresh flooding in southern Pakistan has displaced almost a million people in the past 48 hours.
In Sindh province, 200,000 residents of the town of Thatta have been forced to flee to safer areas after the Indus river burst its banks.
The army and navy were involved in their evacuation from the town, 70km east of Karachi.
Engineers are now trying to repair a six metre breach before the centre of Thatta is swamped.
Information Minister Qamar Zaman Kaira said low-lying areas of Sindh province would remain under water for the next two weeks or more. Out of its 23 districts, 19 have so far been badly affected by the floods.
Meanwhile, floodwaters in the north of the country are starting to recede revealing the full extent of the disaster that has affected some 17 million people.