KHARTOUM - Warplanes on bombing raids drew heavy anti-aircraft fire over Khartoum on Saturday as fierce fighting between Sudan's army and paramilitaries entered a third week, violating a renewed truce.
More than 500 people have been killed since battles erupted on April 15 between the forces of army chief Abdel Fattah al-Burhan and his number two Mohamed Hamdan Daglo, who commands the paramilitary Rapid Support Forces (RSF).
"There is no right to go on fighting for power when the country is falling apart," UN Secretary-General Antonio Guterres told Al Arabiya television.
Burhan and Daglo have agreed to multiple truces since the war began, but none has effectively taken hold as the number of dead civilians continues to rise, thousands flee the country and those without the means to escape face an increasing struggle to survive.
The latest three-day ceasefire is due to expire at midnight Sunday. It was agreed Thursday after mediation led by the United States, Saudi Arabia, the African Union and the United Nations.
Dozens more have died over the past week since the United States announced that the warring sides had agreed to an initial truce, on April 24.
"We woke up once again to the sound of fighter jets and anti-aircraft weapons blasting all over our neighbourhood," a witness in southern Khartoum told AFP.
Another witness said fighting had continued since the early morning, especially around the state broadcaster's headquarters in the capital's twin city of Omdurman.
Residents across Khartoum -- home to five million people -- have largely sheltered at home despite supplies of food and water dwindling to dangerously low levels, and a lack of electricity.
Some managed to sneak out only during brief lulls in fighting to buy desperately needed supplies.
About 75,000 have been displaced by the fighting in Khartoum and the states of Blue Nile, North Kordofan, as well as the western region of Darfur, the UN said.
Tens of thousands of Sudanese have fled into neighbouring countries including Egypt, Ethiopia, Chad and South Sudan, while foreign countries have carried out mass evacuations of their nationals.