Sudan's military council spokesman said on Friday that nine soldiers from the Rapid Support Forces (RSF) have been dismissed and detained in connection with the killing of protesters this week.
Lieutenant General Shams El Din Kabbashi added that the governor of North Kordofan state and its security council would also be held accountable for the killing of six people, including four schoolchildren, in the state capital El-Obeid on Monday.
Opposition groups have accused the RSF, led by the deputy head of Sudan's Transitional Military Council, of killing scores of protesters demanding a return to civilian rule since President Omar al-Bashir was ousted in April.
The RSF's commander, General Mohamed Hamdan Dagalo, known as Hemedti, has previously denied these claims and blamed "infiltrators" instead.
The main opposition coalition, the Forces of Freedom and Change (FFC), welcomed the action against the RSF members, saying it would prevent further violence.
Hundreds of thousands of Sudanese took to the streets on Thursday in response to the killings in El-Obeid, and opposition medics said four more protesters were killed and many injured by gunfire in the capital's twin city of Omdurman.