Sudan's public prosecutor on Thursday ordered ousted President Omar al-Bashir to be interrogated on charges of money laundering and financing terrorism, as hundreds of thousands of protesters joined a sit-in to demand the army give way to civilian rule.
Bashir was removed by the military on April 11 after months of demonstrations against his 30-year rule.
He is also wanted by the International Criminal Court in the Hague for war crimes over the conflict in Sudan`s Darfur region.
The prosecutor`s statement said other unidentified senior figures would also be investigated for financial crimes.
The huge crowd that gathered on Thursday outside the defence ministry was answering a call by an alliance of activists and opposition groups to join a protest march through Khartoum.
The Declaration of Freedom and Change Forces (DFCF) alliance said on Thursday it had sent the Transitional Military Council (TMC) set up after Bashir`s ouster a draft constitutional document containing its vision for the transitional period.
Protesters and activists have been negotiating with the TMC to form a joint civilian-military body to oversee the country until elections.
But the parties are deadlocked over who would control the new council and what the features of a transitional government would be.
The constitutional draft, seen by Reuters, outlines the duties of a sovereign transitional council which the opposition groups hope will replace the TMC but does not specify who would sit on it.
It also outlines the responsibilities of the cabinet and a 120-member legislature.
Opposition groups say the ruling council must be civilian-led and have promised to maintain a sit-in outside the Defence Ministry until their demands are met, but the TMC has shown no sign of willingness to relinquish ultimate authority.
At a televised news conference, a spokesman for the DFCF said it expected a response from the military to its constitutional draft within two or three days.
The TMC acknowledged receiving the draft and said in a statement that this step pushes the dialogue forward.