The Sudanese army says it would airlift diplomats and nationals from the UK, US, France, and China as combat continues.
It stated army chief Fattah al-Burhan will help evacuate them “in the coming hours”.
He battles the Rapid Support Forces chief.
The UK government prepared for “a number of contingencies”.
Safety concerns prevented foreign national evacuation preparations.
The army said military transport planes would transfer British, US, French, and Chinese diplomats and nationals from Khartoum.
The UK claimed it was “doing everything possible to support British nationals and diplomatic staff in Khartoum”.
It said its defence ministry and foreign office were preparing for several provisions, without indicating if quick evacuations were among them.
UK Prime Minister Rishi Sunak chaired a Cobra meeting on Sudan on Saturday morning.
A British citizen in Khartoum told the BBC she felt “completely abandoned” by the British government and had not been given “much information at all” on evacuation arrangements.
“It remains very depressing, worrying and confusing to be a Brit on the ground here,” she said. “We’re still very much in the dark”.
“We don’t have a plan. We know this is a fluid situation, but we feel abandoned here.”
Saudi Arabia declared it will evacuate its people and “brotherly” nationals. On Saturday, state TV channel Al-Ekhbariyah claimed that several Saudis and others arrived in Jeddah.
Spain’s defence minister said six planes were being sent to Djibouti to evacuate nationals and others.
The violence has blocked Khartoum’s international airport, preventing embassies like the UK and US from returning their citizens.
Despite the army and RSF agreeing to a three-day ceasefire for Eid al-Fitr starting Friday, the crisis has reached its second week.
Saturday’s truce saw intermittent gunfire and air strikes in the capital.
Mariam al-Mahdi, a former foreign minister hiding in Khartoum, told the BBC the truce was “not taking at all”.
24 hours without power. “Six days without water,” she said.
She stated, “There are rotting bodies of our youth in the streets.”
After differences between General Burhan and the RSF’s Mohamed Hamdan “Hemedti” Dagalo over Sudan’s governance, Khartoum erupted in street fights on 15 April.
After the 2019 coup that overthrew Omar al-Bashir, they both held important roles in Sudan’s military administration.
The RSF mobilised its troops to reject the merger, which led to full-scale combat last week.
The WHO reports over 400 deaths. People struggle to reach hospitals, raising the death toll.
Thousands of civilians have been hurt, straining medical facilities.
The battle has also devastated western Darfur, where the RSF originated, along with Khartoum.
The UN estimates that 20,000 people, mostly women and children, have fled Sudan to Chad via Darfur.
