One third of displaced people in Darfur are cut off from aid

In the last three months alone, there had been 200,000 people newly displaced in Darfur, said Ted Chaiban, head of Unicef's mission to Sudan.

In any other country that would be front-page news, he said.

"Southern Darfur has seen both government-rebel fighting but also jockeying for power between the rebel movements," Mr Chaiban said.

About a third of displaced people are cut off from aid as humanitarian agencies cannot reach them because of the fighting.