Health officials have warned of large-scale outbreaks of disease in Pakistan after severe flooding displaced millions of people.

A rise in cases of diarrhoea and malaria has been reported after months of heavy rains left people stranded and without access to clean water.

Authorities say they are concerned that the spread of waterborne diseases after the floods, which have killed almost 1,200 people, will further strain health facilities. More than 880 clinics have been damaged, according to the World Health Organization, which has allocated $10m (£8.6m) to emergency health relief efforts.

Tedros Adhanom Ghebreyesus, director general of the WHO, said on Wednesday that the agency had classified the floods as the highest level of emergency. He said the threat of waterborne diseases meant access to health services and disease monitoring and controls were a “key priority”.