A medical organisation in Sudan has said it is impossible to know the number of people killed and wounded during the public protests against Monday's coup.
The Central Committee of Sudanese Doctors said at least eight had definitely died, but it accused militias of causing bloody incidents in several cities, using live bullets against unarmed civilians including children and the elderly.
There are unconfirmed accounts of mass arrests.
In a statement, US President Joe Biden called recent events a grave setback and demanded the restoration of the civilian-led transitional government.
The toppled Prime Minister, Abdalla Hamdok, remains under house arrest and a group of his former ministers say they were turned away on Thursday on attempting to visit him.
Pro-democracy protesters are calling for a "march of millions" on Saturday.
Credit: The BBC