Saudi Arabia and the United States have denounced the escalation of hostilities in Khartoum, the capital of Sudan, where locals have reported airstrikes and artillery firefights.

The two nations expressed their disappointment that fighting had restarted, noting that the Sudanese army and the paramilitary Rapid Support soldiers had controlled their soldiers during a 24-hour ceasefire.

Heavy clashes and artillery fire erupted across Sudan’s capital Khartoum as soon as the 24-hour ceasefire ended on Sunday.

“The Kingdom of Saudi Arabia and the United States continue to stand by the people of Sudan and urge the parties to end the fighting immediately. The statement said.

Saudi Arabia and the US have taken the lead to restore relative calm between the fighting sides.

Saudi Arabia’s foreign ministry issued a warning earlier this week that the country might give up on peace talks if the parties fail to honour the Saturday truce.

Gen. Fattah al-Burhan, the de facto leader of Sudan’s army, and Gen. Mohamed Hamdan Dagolo, the leader of the Rapid Support Forces, were both sanctioned by the US after the previous peace deal collapsed.

More than 1,800 have been reported killed according to the Armed Conflict Location and Event Data Project while the United Nations estimates indicated that at least 1.5 million Sudanese have fled their homes since the conflict began in April.

The conflict has turned Khartoum and other urban areas into battlegrounds, resulting in widespread theft and devastation of residential areas throughout the country.