Sudan's warring generals pledged Tuesday to observe a new three-day truce brokered by the United States and Saudi Arabia in an attempt to pull Africa's third-largest nation back from the abyss. The claims were immediately undercut by the sound of heavy gunfire and explosions in the capital of Khartoum. Residents said warplanes were flying overhead, The Associated Press said. Several previous cease-fires declared since the April 15 outbreak of fighting were not observed, although intermittent lulls during the weekend's major Muslim holiday allowed for dramatic evacuations of hundreds of diplomats, aid workers and other foreigners by air and land. For many Sudanese, the departure of foreigners and closure of embassies is a terrifying sign that international powers expect a worsening of the fighting that has already pushed the population into disaster. Meanwhile, Sudanese desperately sought ways to escape the chaos, fearing that the rival camps will escalate their all-out battle for power once evacuations are completed. Late Monday, US Secretary of State Antony Blinken announced that he had helped broker a new 72-hour cease-fire. The truce would be an extension of the nominal three-day holiday cease-fire. The Sudanese military, commanded by Gen. Abdel Fattah Burhan, and the rival Rapid Support Forces, a paramilitary group led by Gen. Mohammed Hamdan Dagalo, said Tuesday they would observe the cease-fire. “This cease-fire aims to establish humanitarian corridors, allowing citizens and residents to access essential resources, healthcare, and safe zones, while also evacuating diplomatic missions,” the RSF said in a statement. The army announcement used similar language, adding that it will abide by the truce “on the condition that the rebels commit to stopping all hostilities.” But fighting continued, including in Omdurman, a city across the Nile River from Khartoum. Omdurman resident Amin Ishaq said there were clashes early Tuesday around the state television headquarters and around military bases just outside Omdurman. “They did not stop fighting,” he said. “They stop only when they run out of ammunition.” “Sounds of gunfire, explosions and flying warplanes are still heard across Khartoum,” said Atiya Abdalla Atiya, a senior figure in the Sudan Doctors’ Syndicate, a group that monitors casualties. “They don’t respect cease-fires.” Atiya said he suspected the main purpose of declaring a new cease-fire was to allow for more foreigners to be evacuated. Atiya and Farah Abass, another Khartoum resident, said people were still fleeing Khartoum on Tuesday. Bus stations were packed with many who had spent the night there, hoping to get a seat on a departing bus, they said. Drivers increased prices, sometimes tenfold, for routes to Port Sudan or the border crossing with Egypt. Sudan was once a symbol of hope because of its fitful efforts to transition from decades of autocratic rule to democracy. Now it faces a bleak future. Even before April 15, one-third of the population of 46 million relied on humanitarian assistance. Most of those providing aid have suspended operations. In the past 11 days, Sudanese have faced a harrowing search for safety in the constantly shifting battle of explosions, gunfire and armed fighters looting shops and homes. Many have been huddling in their homes for days. Food and fuel are leaping in price and harder to find, electricity and internet are cut off in much of the country, and hospitals are near collapse. Those who can afford it were making the 15-hour drive to the Egyptian border or to Port Sudan on the Red Sea coast. Those without means to get abroad streamed out to relatively calmer provinces along the Nile, north and south of Khartoum. United Nations Secretary-General Antonio Guterres warned of a “catastrophic conflagration” that could engulf the whole region. He urged the 15 members of the Security Council to “exert maximum leverage” on both sides in order to “pull Sudan back from the edge of the abyss.” More than 420 people, including at least 291 civilians, have been killed and over 3,700 wounded since the fighting began. The military has appeared to have the upper hand in Khartoum but the RSF still controls many districts in the capital and Omdurman, and has several large strongholds around the country. Meanwhile, airlifts of foreigners continued. Britain said Tuesday that it will run evacuation flights for UK nationals from Sudan from an airfield outside Khartoum. Officials have said there are as many as 4,000 British citizens in Sudan, 2,000 of whom have registered for potential evacuation. The Foreign Office said priority would be given to families with children, the sick and the elderly. Britain evacuated its diplomats from Sudan in a military operation over the weekend. The government has come under growing criticism for its failure to airlift civilians, as some European countries have done. Germany said one of its rescue planes flew another mission early Tuesday, bringing the total of people evacuated to nearly 500. France secured the use of a base on the outskirts of Khartoum to act as an extraction point after intense negotiations with both sides — the military that held the base and the RSF that held the surrounding districts, a French diplomatic official said, speaking on condition of anonymity to discuss the operation. Amid continued gunfire, nationals from dozens of countries made their way to the base. Some braved the roads in their own vehicles while others called on private security firms to shepherd them through military and RSF checkpoints. France brought out nearly 500 people, including citizens from 36 countries, on flights to the nearby Horn of Africa nation of Djibouti. Military planes from the Netherlands, Germany, Italy, Spain, Jordan and Greece also picked up loads of passengers. In fighting Monday, an administrator at Egypt's Embassy in Khartoum was killed on his way to work to help oversee the evacuations, the Foreign Ministry in Cairo said, without saying who was responsible. Cairo has close ties to the Sudanese army but has joined calls for a cease-fire. The United States said Monday that it has begun facilitating the departure of private US citizens after swooping in to extract diplomats on Sunday. White House national security adviser Jake Sullivan said the US has placed intelligence and reconnaissance assets over the evacuation route from Khartoum to Port Sudan but does not have any US troops on the ground. Despite the pullout, US and European officials insisted they were still engaged in trying to secure an end to the fighting. But so far the conflict has shown how little leverage they have with Burhan and Dagalo who appear determined to fight to the end. The US and EU have been dealing with the generals for years, trying to push them into ceding power to a democratic, civilian government. A pro-democracy uprising led to the 2019 ouster of former strongman Omar al-Bashir. But in 2021, Burhan and Dagalo joined forces to seize power in a coup.