In a makeshift tent covered in a torn tarp, Zakaria Hassan tried to make his baby son more comfortable after they fled fighting near the Central African Republic's border with Sudan.

Lying on a mat, the eight-month-old infant slept fitfully, his forehead burning up with a high temperature.

"He's been sick for a few days. I don't have any medicine to give him," Hassan said.

He was forced to grab his children and a handful of belongings and run after fierce clashes broke out in Am-Dafock, a town on the Central African Republic (CAR) side of the border.

The strategic area regularly faces incursions by armed groups on both sides.