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© NASAThis NASA image shows the severity of flooding in Sukkur city in Sindh province
Thousands more people in Pakistan have been forced to flee their homes as fresh flooding has submerged dozens more towns and villages in the south.

Around 150,000 Pakistanis in Sindh province have been evacuated to higher ground because of the swollen Indus River, a government spokesman said.

Officials expect the floodwaters to recede nationwide in the next few days as the last river torrents empty into the Arabian Sea.

But survivors may find little left when they return home - the waters have washed away houses, roads, bridges and crops, and leaving millions homeless and penniless.

In Sindh, there are already 600,000 people in relief camps set up during the flooding.

At a camp in the Sukkur area, some victims said it was difficult to get access to food dropped off by relief trucks.

"I am a widow, and my children are too young to get food because of the chaos and rush," Parveen Roshan said.

"How can weak women win a fight with men to get food?"

Nearby, a doctor treated a boy whose back was injured after someone pushed him during a scramble for food at a truck.

The floods, which began in late July after exceptionally heavy monsoon rains, have affected about one third of the country.

At least 20 million people have been affected overall, with six million made homeless and eight million in urgent need of humanitarian assistance.

The official death toll is around 1,500 but the true number of victims may turn out to be higher because large areas of the country are still inaccessible, officials say.

The United Nations has appealed for $460m (£296m) in emergency assistance, of which Secretary General Ban Ki-moon said about 60% had been pledged.

Pakistan has also accepted $5m (£3.2m) in aid from India, its archrival.

The crisis has raised concerns about the Pakistani government which has been criticised by its slow response to the disaster.

Aid groups have been trying to help the government in its relief effort by providing food, medicine, shelter and other crucial assistance.

But continued poor weather and the destruction of roads and bridges have hindered the distribution.

Meanwhile, a bomb exploded at a checkpoint jointly manned by pro-government tribesmen and police in Mohmand in the north west, killing six people, a government official said.

The bombing underscored the fear that militants still pose a challenge to the government, which has carried out operations to flush Taliban and their supporters from the region.