At least four Sudanese protesters and a member of the security forces have died in clashes in the capital, Khartoum.
They were killed in gunfire at a sit-in outside military HQ where demonstrators are demanding full civilian government.
Protesters said soldiers were responsible, but the army blamed it on “unidentified elements”.
Sudan has been governed by a transitional military council since the overthrow of President Omar al-Bashir last month.
Demonstrators have been occupying the square in front of the headquarters since 6 April, five days before the president was toppled by the military.