The deadly conflict in Sudan entered its third week as rival military forces accused each other of fresh violations of a cease-fire that was set to expire Sunday.
The country continued a slide toward catastrophic civil war, as hundreds of people have been killed and thousands wounded since a long-simmering power struggle between the Sudanese army and the paramilitary Rapid Support Forces (RSF) erupted into conflict on April 15.
Locked in a battle for Khartoum, Sudan's capital on the Nile, the parties have fought on despite a series of cease-fires secured by mediators including the United States, the latest of which expires at midnight (2200 GMT).
The situation in Khartoum, where the army has been battling RSF forces entrenched in residential areas, was relatively calm Sunday morning, a Reuters journalist said, after heavy clashes were heard on Saturday evening near the city center.
The Sudanese army said Sunday it had destroyed RSF convoys moving towards Khartoum from the west. The RSF said the army had used artillery and warplanes to attack its positions in a number of areas in Khartoum province.
Reuters could not independently verify the reports.
In an apparent bid to boost its forces in the capital, the army said Saturday that the Central Reserve Police had begun to deploy in southern Khartoum and would be deployed gradually in other areas of the capital.
The Central Reserve Police is a large and heavily-armed division of Sudan's police force that has fighting experience from conflicts in the western region of Darfur and in the Nuba Mountains in southern Sudan.
In March 2022, the United States imposed sanctions on the Central Reserve Police, accusing it of using excessive force against protesters who were demonstrating in Khartoum and other places against a 2021 military coup.
The fighting in Khartoum has so far seen RSF forces fan out across the city as the army tries to target them largely by using airstrikes from drones and fighter jets.
This month's conflict has sent tens of thousands of people fleeing into neighboring states and prompted warnings that Sudan could disintegrate, destabilizing a volatile region.
It has also derailed an internationally-backed political transition aimed at establishing a democratic government in Sudan, where former autocratic President Omar Hassan al-Bashir was toppled in 2019 after three decades in power.
The prospects for negotiations have so far seemed bleak.
Army leader Gen. Abdel Fattah al-Burhan has said he would never sit down with General Mohamed Hamdan Daglo, also known as Hemedti. The RSF chief in turn said he would talk only after the army ceased hostilities.
Nonetheless, U.N. special representative in Sudan, Volker Perthes, told Reuters Saturday he had recently sensed a change in the sides' attitudes and they were more open to negotiations and were saying they would accept "some form of talks."
At least 528 people have been killed and 4,599 wounded, the health ministry said. The United Nations has reported a similar number of dead but believes the real toll is much higher.
Foreign nationals have fled in one of the largest such evacuations since U.S.-led forces withdrew from Afghanistan in 2021.
A U.S.-government organized convoy arrived at the Red Sea city of Port Sudan on Saturday, evacuating U.S. citizens, local staff and others.
The U.S. government will help evacuees travel on to Jeddah, Saudi Arabia, U.S. State Department spokesperson Matthew Miller said. He did not say how many Americans remained in the country.
Britain's Foreign Ministry said Saturday it had evacuated 1,888 people on 21 flights since its evacuation operation started last Tuesday.
