The British evacuation mission has rescued nearly 900 people from Sudan amid fears that fierce fighting could resume as the end of an agreed ceasefire approaches.
Foreign Secretary James Cleverly has said it will be “potentially impossible” to continue the operation after the truce agreed between rival generals ends at midnight.
As of 4pm on Thursday, the Foreign Office said that 897 people had been evacuated over eight RAF airlifts.
The Foreign Office, which has not said how many of the evacuees are Britons or foreign nationals, urged citizens to head to the airstrip before the ceasefire ends.
However, the flights are scheduled to run past midnight and around 1,000 people are expected to have been lifted to safety by Friday morning.
Military chiefs say they have the capacity to lift at least 500 people per day out of the Wadi Saeedna airfield near the capital of Khartoum.
Mr Cleverly warned that resumption of fighting could jeopardise the evacuation efforts.
“We cannot predict exactly what will happen when that ceasefire ends, but what we do know is it will be much, much harder, potentially impossible,” he told Sky News.
“So, what we’re saying to British nationals is if you’re hesitant, if you’re weighing up your options, our strong, strong advice is to go through Wadi Saeedna whilst the ceasefire is up and running.
“There are planes, there is capacity, we will lift you out. I’m not able to make those same assurances once a ceasefire has ended.”
Downing Street rejected calls from people, including Foreign Affairs Committee chairwoman Alicia Keans, to widen the eligibility for evacuation beyond British passport holders and their immediate family.
But the Prime Minister’s official spokesman said: “There is an element of discretion for people on the ground as you might expect, given the circumstances and the challenging situation people will be facing.
“We recognise these are very challenging circumstances and, as we have done on previous occasions, we obviously empower people on the ground to make decisions.”
The diplomat, who was not in Sudan when the fighting broke out, was being relocated from London to Addis Ababa in Ethiopia to play a key role in efforts to end the fighting.
Africa minister Andrew Mitchell warned that an end to the ceasefire could result in a humanitarian catastrophe in Sudan.
“It is essential that a ceasefire is maintained and that a political process is secured,” he told the foreign affairs think tank Chatham House.
“If not, the humanitarian consequences will be incalculable.”