Authorities are preparing for flooding in southern Pakistanas the worst monsoon rains in decades leaves an ever-increasing trail of death and destruction.
Meanwhile, massive flooding in other parts of the country has threatened electricity generation plants, forcing units to shut down in a country suffering from a crippling energy crisis, officials say.
During the past week, floods have spread down the country from the northwest, killing about 1500 people and affecting upward of four million people.
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Much of the destruction has come from the mighty Indus River, which in better times irrigates vast swaths of farmland.
Some 30,000 Pakistan soldiers are rebuilding bridges, delivering food and setting up relief camps in the northwest, which is the main battleground in the fight against al-Qaeda and the Taliban.
Foreign countries and the United Nations have donated millions of dollars, and US army helicopters are also helping out.
River embankments were being strengthened and people evacuated from low lying villages in Sukkur district in Sindh province, said regional irrigation minister Jam Saifullah Dharejo.
The US Embassy said 85 military service people were taking part in the US relief mission, which is taking place in the northwest, where the destruction has been the most serious.
On Thursday, six choppers picked up around 800 stranded people and dropped off emergency aid.
Pakistan Electric Power Co director-general, Mohammad Khalid, said that in the northwestern province of Khyber Pakhtunkhwa, three grid stations in Dera Ismail Khan, Swat and Shangla were shut down by the floods.
Two private power plants producing 350 megawatts each also closed as floodwater entered the courtyard of one plant, he said.
Sohail Tipu, a senior government official in the central province of Punjab, said the town of Kot Addu was cut off because of flooding and that the government was making "maximum efforts" to rescue people.
Pakistan only produces about 80 per cent of the electricity it needs, leading to massive power outages and sparking summer protests against the government.
