Hundreds of people in the Sudanese capital, Khartoum, have taken part in a vigil in memory of pro-democracy protesters who were killed last month by the security forces.
Earlier, police were reported to have used tear gas to disperse crowds who had gathered to denounce the killing on Sunday of a demonstrator in the south of the country.
Sudan's military rulers and the civilian opposition are scheduled to meet on Tuesday to discuss the details of a power-sharing agreement.
Previous efforts in recent days have been postponed.
The military has so far failed to relinquish power since President Omar al-Bashir was overthrown in April.
Watch the BBC Africa Eye documentary on the events of 3 June: