There are reports of heavy fighting south of the Sudanese capital, Khartoum, in an area which is home to hundreds of thousands of civilians displaced by the war.
Eyewitnesses report a major incursion by the paramilitary Rapid Support Forces (RSF) in al-Jazira state.
It had been a relatively safe haven.
Since the war broke out in April, around seven million Sudanese people have been forced to flee their homes.
Less than a week ago regional leaders said the warring sides in Sudan had agreed to meet for face-to-face talks to end the fighting.
But instead, the war is escalating and the displaced are getting ready to flee for their lives again.
Battles for control of Khartoum forced close to half a million people to head south into al-Jazira.
But after a major offensive by the RSF there’s been fighting close to the state capital, Wad Madina, and there are fighter jets overhead.
The fact that this is a major agricultural region is also bad news in a country where millions are in desperate need of food aid but cannot be reached because of the war.
