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Millions of Pakistanis have been displaced by the floods The UN says it is reviewing security measures for its aid workers in Pakistan, after a warning of new threats from the Pakistani Taliban.
A US official said the militant group was planning to attack foreigners delivering aid to millions of people affected by the floods.
There have been no reports of attacks so far.
It has now been four weeks since the start of the flooding, described as the region's worst humanitarian crisis.
The UN says more than 17 million people have been affected by the floods, and about 1.2 million homes have been destroyed, leaving five million people homeless.
As floods sweep down from the north, they are now threatening to breach an embankment in the Kot Almo area in Sindh province, forcing thousands of people in the southern Thatta district to flee from their homes.
Aid agencies are focusing on providing emergency relief such as shelter, food and medical care.
'Plans to attack'
The militant group Tehrik-e Taliban "plans to conduct attacks against foreigners participating in the ongoing flood relief operations in Pakistan", a US official, speaking on condition of anonymity, told the BBC.
The official also said "federal and provincial ministers" may be at risk.
The sense from Washington is that this threat is both serious and credible. Tehrik-e Taliban is the most radical and violent militant group in Pakistan, based in the tribal region close to the border with Afghanistan. It's been associated with a series of attacks in recent years on the Pakistani state and on foreigners, and is closely allied to al-Qaeda.
In the past six months, the level of militant violence has reduced, but since the flood crisis began, the Pakistani Taliban has warned against accepting international aid. Its leaders seem to view foreign assistance and the presence of international aid workers as unwelcome Western interference in their country.
All this is a further blow to aid workers who are already battling with plenty of logistical challenges.
A spokesman for the World Health Organization told the BBC that aid work in Khyber-Pakhtunkhwa and Baluchistan was already being affected by security concerns.
"Now with this threat it means either we have to downsize the operation – which means less access to the affectees – otherwise we have to take more mitigation measures in order to reduce the security risk, which means more resources," Ahmed Farah Shadoul said.
"This will definitely delay the operation in certain areas."
Earlier, US General Michael Nagata said his forces had seen no threats to their security in the three weeks that they had been operating in Pakistan.
He said the fleet of 19 US helicopters had helped save more than 6,000 people.
Tehrik-e Taliban is considered the most radical and violent militant group in Pakistan.
A retired Pakistani general, Talat Masood, told the BBC that the militant group would seek to counter any gains in public support for Western governments helping with relief and aid work.
The US is one of a number of countries to have sent aid and assistance to Pakistan. The US Agency for International Development says that it has so far provided around $150m (‚£97m) in support to victims of the flood.
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The UN's Mauritzio Guilliano explains how the UN aid agencies are familiar with such threats
However, the head of its development agency, Rajiv Shah, sounded a warning about accountability and corruption.
Long-term aid money would "would require a demonstration of real transparency and accountability and that resources spent in Pakistan get results", he told the Associated Press news agency.
Various nations have pledged more than $700m (‚£552m) for relief efforts in Pakistan.
Workers have begun clearing up as the floods recede in the north and the UN has appealed for more helicopters to reach 800,000 people who are cut off.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.