Diplomats and nationals from Britain, the United States, France and China will be evacuated from Sudan as fighting continues there, the Sudanese army said in a statement.
It said Army Chief of Staff Fateh Burhan agreed to assist and secure their evacuation “in the coming hours”.
He has been embroiled in a bitter power struggle with the leader of the rival paramilitary faction Rapid Support Forces.
The UK government said it was preparing for a “series of contingencies”.
Previous plans to evacuate foreigners have not been implemented due to security concerns.
Nationals and diplomats from Britain, the United States, France and China were being evacuated from the capital Khartoum on military transport planes, a military statement said.
The UK government said it was “doing everything possible to support British nationals and diplomatic staff in Khartoum”.
It said its defense ministry was working with the foreign ministry on a set of regulations, but did not specify whether an immediate evacuation was among those plans.
On Saturday morning, British Prime Minister Rishi Sunak chaired a Cobra meeting – an emergency committee – on the situation in Sudan.
Saudi Arabia also said it would arrange for the evacuation of its citizens and nationals of “fraternal” countries. State-run Al-Ekhbariyah television reported that some Saudi citizens and other nationals arrived in the port city of Jeddah on Saturday.
Khartoum’s international airport has been closed because of the violence, and foreign embassies including Britain and the United States have been unable to bring their citizens home.
The conflict has entered its second week, although both sides – the army and the RSF – have agreed to a three-day truce to mark the Muslim holiday of Eid al-Fitr, which begins Friday.
Despite the ceasefire, sporadic gunfire and air strikes could be heard in the capital on Saturday.
Former foreign minister Mariam Mahdi, who is seeking asylum in Khartoum, told the BBC the ceasefire “is not going to last at all”.
“We haven’t had electricity for the past 24 hours. We haven’t had water for the past six days,” she said.
Medical teams have been targeted by fighting, she said, adding that “there are the rotting bodies of our young people in the streets.”