Great Britain has carried out a successful evacuation operation for its citizens in Sudan. The British Foreign Minister, Andrew Mitchell, said that they could not leave their citizens in Sudan in such dangerous circumstances.
"We cannot stay there forever in such dangerous circumstances," said Foreign Minister Andre Mitchell.
A 72-hour ceasefire broke down on Saturday, with armed factions launching their battle for the capital.
Bombers and heavy artillery have targeted parts of Khartoum, while the Sudanese army claimed it was attacking the city from all directions in an attempt to drive out the paramilitary Rapid Support Force.
Tens of thousands of people have fled the country since fighting engulfed Sudan two weeks ago.
The death toll is thought to be much higher than the latest official figure of 459, and the United Nations fears hundreds of thousands could be displaced if the conflict continues.
The former prime minister of Sudan has warned that the conflict could become worse than that in Syria and Libya.
Other countries have immediately evacuated their citizens, while some have left through unofficial routes by boat and bus.
On Saturday evening the US government said it had completed the first rescue of its citizens. American citizens and permanent residents had been convoyed to Port Sudan and were crossing the Red Sea by boat to Jeddah in Saudi Arabia.