Artillery fire was heard in parts of Khartoum and warplanes flew overhead on Tuesday, though an internationally monitored ceasefire appeared to have brought some respite from heavy fighting in the Sudanese capital.
Night-time airstrikes were reported in at least one area after the ceasefire started late on Monday, but residents otherwise reported relative calm.
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The truce was agreed at talks in Jeddah on Saturday after five weeks of fierce battles between the army and the paramilitary Rapid Support Forces (RSF).
It is being tracked by Saudi Arabia and the United States and is meant to allow for the delivery of humanitarian relief.
The two countries said in a joint statement late on Tuesday that preparations had begun for urgently needed humanitarian relief operations.
Sudanese activists wrote to the United Nations envoy to Sudan welcoming the ceasefire agreement but complaining of severe human rights abuses against civilians that they said took place as the fighting raged and should be investigated.
Volunteer groups that have been at the forefront of local aid efforts in the capital were preparing to receive supplies, though much of the aid that has arrived in Port Sudan on the Red Sea coast is yet to be distributed as agencies wait for security clearance.
Editor: Oloyede Oworu
