Hundreds of thousands of people have fled Pakistan's Punjab province after some of the country's worst floods.

The Pakistani army has been using boats and helicopters to evacuate villages to higher ground, as authorities warn of more rainfall.

Fears of severe food shortages have also increased after floods wiped away farmlands and destroyed crops.

Doctors say many survivors are now suffering from waterborne diseases, chest infections and skin problems.

At least 3.2 million people have been affected by the flooding, according to UN figures.

Al Jazeera's Kamal Hyder reports.