Flights to Khartoum have been suspended, neighboring Chad has closed its border with Sudan and internet services have been blocked.
Dozens of civilians have reportedly been killed as the Sudanese military and a powerful paramilitary group battled for control of the country for a second day on Sunday.
Fighting broke out between the army and its rival, the Rapid Support Forces (RSF), on Saturday following months of tensions. The country has been run by generals since the two sides joined forces to oust president Omar Hassan al-Bashir in 2019.
Diplomatic pressure for a cease fire is mounting, with the United States, the United Kingdom, China, Russia, Saudi Arabia, the European Union and others calling for an immediate to end hostilities.
At least 56 civilians have been killed in the clashes, according to the Central Committee of Sudan Doctors. The organization said almost 600 people have been injured, including civilians and fighters.
The fighting, reported in the capital of Khartoum, the adjoining city of Omdurman and in flash points across the country, intensified on Sunday.
