Sudanese security authorities have ordered all foreigners to leave the capital Khartoum and the surrounding region.
They have two weeks to do so, according to a statement from the section of the police dealing with foreigners.
Foreigners should leave for their own safety amid the fighting still raging between government troops and the Rapid Support Forces (RSF) militia, the police said.
According to media reports, hostility towards foreigners, especially those from other African countries, has been on the rise following reports of foreign mercenaries in the RSF ranks.
Just a few days ago, more than 150 foreigners who did not have valid residence papers were detained.
A bloody power struggle has been raging in Sudan for more than a year between de facto ruler Abdel Fattah al-Burhan and his former deputy Mohammed Hamdan Daglo.
According to the UN, the conflict has caused almost 10 million people to flee their homes, and risks a famine in the country.
International aid organisation staff and diplomats still in the country left Khartoum after the outbreak of fighting and are now working from Port Sudan, where the situation is comparatively stable.