An army air strike in Khartoum, the Sudanese capital, killed at least 20 people, including two children.
Activists say many of the victims of the attack in the Kalakla al-Qubba neighborhood of south-west Khartoum were buried in the rubble.
On Sunday, artillery and rocket fire were reported in many parts of Sudan as the clashes between the Sudanese army and rival paramilitary Rapid Support Forces spread.
Since April, the army and the paramilitary Rapid Support Forces (RSF) have been fighting for control of Khartoum, leading to the death of hundreds of people.
According to the country’s health ministry, more than 1,100 people have perished across the country, but the true figure is likely to be significantly higher.
The United Nations said around 2.2 million people have been internally displaced within Sudan, with more than 500,000 seeking refuge in neighboring countries.
The conflict began when army chief Gen Abdel Fattah al-Burhan and RSF chief Gen Mohamed Hamdan Dagalo clashed over the country’s future.
Several ceasefires have been declared to allow people to flee the violent clashes without much productive outcome.