International aid agencies are warning that they may have to halt flood relief efforts in Pakistan due to a major shortage of funds.

The United Nations, Oxfam, Save the Children, Care and ACTED said Wednesday that over 9 million flood victims in Pakistan's southern Sindh province are at risk of disease and widespread malnutrition over two months into the flood crisis.

The U.N. says it has received less than a third of the $357 million appeal it launched in September.

Monsoon rains triggered the floods which killed at least 300 and destroyed more than 1.5 million homes in Sindh and the neighboring province of Baluchistan. The floodwaters also inundated more than two million hectares of farmland.

Aid agencies said Wednesday that they will be forced to cut back their relief efforts in coming months if money is not found to help those in need.

Oxfam said some 4 million people it had planned to reach would go without help.

Care faces a funding shortfall of 91 percent.

The aid agencies say people are being forced to live in desperate conditions. More than three-quarters of affected households have not received any shelter assistance, while some 800,000 people are still displaced.

The United States was the largest contributing nation to the U.N. appeal with $13.4 million. The European Commission gave $20.6 million.

Many in Pakistan are still trying to recover from last year's devastating floods that killed 1,700 people, affected 20 million others and submerged one-fifth of the country.