This day of mobilization is a test for the anti-army front which launched a confrontation with the authorities in early July, the day after the bloodiest day of the clash, when nine protesters were killed on 30 June.
This was followed by the start of the sit-inwhich the front promised would be unlimited.
The rallies resumed during the Eid al-Adha holiday last week as activists try to revive their movement.
At the forefront of their slogans is the Blue Nile State, where a tribal conflict has left 33 dead and 108 injured since the beginning of the week, according to the Ministry of Health.
Eyewitnesses reported that military forces were deployed in thearea of Roseires, the epicenter of Saturday’s violence.
Anti-coup opponents see the key to solving the problem in the hands of the generals and their former rebel allies, who accuse Khartoum of exacerbating ethnic and tribal tensions for personal gain.