At least six Sudanese protesters and a member of the security forces have been reported dead in clashes in the capital, Khartoum.
They were killed in gunfire at a sit-in outside military Headquarters where demonstrators are demanding full civilian government.
According to reports, Dozens have also been injured.
Protesters said soldiers were responsible, but the army blamed it on “unidentified elements”.
Sudan has been ruled by a transitional military council since last month’s toppling of President Omar al-Bashir.
Demonstrators have been occupying the square in front of the headquarters since 6 April, five days before the president was overthrown by the military.