To ensure that the latest cease-fire holds, a monitoring committee consisting of representatives from Saudi Arabia, the United States and the warring factions will be established. The committee will liaise with the warring sides and with aid agencies to make sure that the cease-fire terms are being respected and to investigate any violations.

The agreement late Saturday came after U.S. Secretary of State Antony J. Blinken spoke with General al-Burhan about efforts to stop the fighting and restore essential services. Mr. Blinken urged both sides to uphold the truce to deliver humanitarian aid for the millions of Sudanese suffering after more than five weeks of fighting between the generals’ forces.

“It is past time to silence the guns and allow unhindered humanitarian access,” Mr. Blinken said on Twitter, adding, “the eyes of the world are watching.”

The signing of the agreement came just hours after fighting intensified in the capital, Khartoum, and the adjacent cities of Omdurman and Bahri, with residents reporting incessant gunfire in some neighborhoods and shelling by warplanes.

Violent clashes have also raged in recent days across the city of Nyala, the capital of South Darfur State, in defiance of a truce mediated by local activists and grass-roots organizations. Hundreds of people have also been killed and at least 85,000 others displaced in El Geneina in West Darfur, a region where ethnic violence and indiscriminate killing have surged in recent years.