Just after the ceasefire expired at 6 a.m. (0400 GMT) witnesses said clashes and artillery fire resumed in the north of Omdurman.
"The truce made us relax a bit, but the war and fear are returning today," said Musab Saleh, a 38-year-old resident of southern Khartoum.
Fighting has been concentrated in the capital, much of which has become a war zone plagued by looting and clashes.
'LOOTING EVERYWHERE'Another affected city is El Obeid, capital of North Kordofan State southwest of Khartoum and on a major route to Darfur.
The 24-hour ceasefire that began on Saturday morning was negotiated at talks led by Saudi Arabia and the United States in Jeddah.
Persons:
Witnesses, Haj Youssef, Musab Saleh, Mohamed Salman, Khalid Abdelaziz, Mohamed Nureldin, Aidan Lewis, William Mallard, Jason Neely, Sharon Singleton
Organizations:
Rapid Support Forces, Darfur Bar Association, Thomson
Locations:
Khartoum, Egypt, KHARTOUM, Sudan's, Sunday, Haj, Bahri, Omdurman, Shambat, Darfur, El Geneina, Chad, El Obeid, North Kordofan State, Kordofan, Sudanese, Saudi Arabia, United States, Jeddah, Dubai, Nafisa, Cairo