Further downpours in Pakistan are hampering efforts to help millions of people affected by severe flooding in much of the country.
The National Disaster Management Authority says at least 1600 people have died in the floods and 650,000 houses have been destroyed. The floods have reportedly affected as many as 14 million people.
Helicopter missions in the north-west have been grounded because of further heavy rain, and a red alert has been issued for the south, the BBC reports.
The helicopters are essential in the region's rugged terrain because the floods damaged or destroyed most of the bridges, cutting off many survivors from relief.
One dam in the southern Sindh province has been breached and engineers are warning that two other huge dams are close to maximum levels.
Pakistan's meteorological office has warned that at least two more days of rain are expected in Sindh, where authorities have declared an imminent and extreme flood threat. More rain is also forecast in the badly hit north-western province of Khyber-Pakhtunkhwa.
Protesters object to president's absence
Pakistan's president Asif Ali Zardari has faced protests in Britain about his decision to continue with his foreign trip rather than return to deal with the flooding.
About 100 demonstrators gathered in Birmingham, where the president made a speech to hundreds of members of his Pakistan Peoples Party.
Mr Zardari has rejected the criticism, telling the BBC he had secured promises of assistance from the countries he had visited: the UAE, France and the UK.
He said Pakistan's cabinet was directing relief efforts and he was being kept up to date about the situation.
