At least 1,200 children in refugee camps in Sudan have died since May because of measles and malnutrition, the UN children's agency (Unicef) says.

Many thousands more, including new-borns, are at risk of death before the end of the year, it says.

More than 50,000 children require treatment for the most lethal form of malnutrition every month in Sudan.

But Unicef says the war has forced a number of feeding centres to close.

The UN refugee agency says many of the children dying in the refugee camps have fled wars in South Sudan and Ethiopia.