Residents of Khartoum, the capital city of Sudan, said that fighting intensified in several areas of the city after the end of a ceasefire.
Sudanese activists indicated that new violence broke out in North Darfur state, which claimed the lives of at least 40 people, while the rainy season may exacerbate the humanitarian crisis.
A ceasefire between the Sudanese Armed Forces (SAF) and the paramilitary Rapid Support Forces (RSF) resumed on May 22 and expired on Saturday night.
The cease-fire brokered by Saudi Arabia and the United States led to a slight calm in the fighting and allowed the arrival of limited humanitarian aid, but it was marred, like other previous cease-fire declarations, with several violations.
The bloody power struggle broke out in Sudan on April 15 and caused a major humanitarian crisis, during which more than 1.2 million people were displaced within the country and 400,000 fled to neighboring countries.
The conflict in Sudan also threatens to destabilize the entire region.