The warring sides in Sudan have agreed with extension of the ceasefire for another 72 hours as the paramilitary Support Forces (RSF) and the army blame each other for violation of the truce.

The deal, which was originally mediated by the United States and Saudi Arabia, was expected to expire at midnight on Sunday.

After the Sudanese army said in a Sunday statement that it had agreed to extend the truce for a period of 72 hours, the RSF said it had also agreed to the extension "in response to international, regional, and local calls."

Since the two sides started fighting on April 15, more than 500 people have been killed, while hospitals and other services have been knocked out, and residential areas turned into war zones.

Thousands have also been wounded in the fighting, which has displaced tens of thousands of people.

After announcing its agreement to truce extension, the Sudanese army said it hoped what it called the "rebels" would abide by the deal, adding, however, that it believed they intended to keep up attacks.

The army also claimed that it had destroyed RSF convoys moving towards the capital Khartoum from the direction of the west.

The RSF said the army used artillery and warplanes to attack its positions in a number of areas in Khartoum Province.

Speaking on Saturday, Sudan's former prime minister warned that the ongoing conflict could turn into one of the world's worst civil wars if it is left unchecked.

"God forbid if Sudan is to reach a point of civil war proper... Syria, Yemen, Libya would be a small play," Abdalla Hamdok said, adding, "I think it would be a nightmare for the world."

Meanwhile, the prospect of negotiations between the warring sides remains bleak.

Army chief, General Abdel Fattah al-Burhan, has ruled out sitting down for talks with the head of the RSF, General Mohamed Hamdan Dagalo, who, in turn, said he would talk only after the army has ceased hostilities.

"There are no direct negotiations, [but] there are preparations for talks," Volker Perthes, the UN special representative in Sudan, told journalists in Port Sudan.

Perthes, who had earlier alleged that the sides were more open to negotiations than before, said he hoped a direct meeting between representatives of the warring sides would be held as soon as possible aimed at "achieving an organized ceasefire with a monitoring mechanism."