Witnesses also reported a sharp increase in violence in recent days in Nyala, the largest city in the western Darfur region.
The U.N. raised the alarm on Saturday over ethnic targeting and the killing of people from the Masalit community in El Geneina in West Darfur.
Khartoum and El Geneina have been worst affected by the war, although last week tensions and clashes escalated in other parts of Darfur and in Kordofan, in the south.
The Central Reserve Police has been deployed by the army in ground fighting in recent weeks.
There was also fighting between the army and the RSF last week around El Fashir, capital of North Darfur, which the U.N. says is inaccessible to humanitarian workers.
Persons:
Witnesses, El Geneina, Abdel Fattah al, Burhan, Mohamed Hamdan Dagalo, Mohamed al, Samani, Saleh Haroun, El, U.N, Ravina Shamdasani, Khalid Abdelaziz, Emma Farge, Aidan Lewis, Helen Popper, Giles Elgood, Mark Porter
Organizations:
Sudan's, Rapid Support Forces, Central Reserve Police, Reuters, Human, International Organization for Migration, Thomson
Locations:
Jeddah, Khartoum, Bahri, Omdurman, Nyala, Darfur, El Geneina, West Darfur, El, Kordofan, United States, Saudi Arabia, Omdurman we've, El Fashir, North Darfur, Chad, Sudan, Dubai, Geneva