Sudanese authorities have put up barricades outside the military headquarters to stop protesters from gathering there.
Crowds are expected to mark a year since a violent crackdown by security forces in which more than 100 people were killed and 700 others wounded.
The uprising saw President Omar al-Bashir removed from power.
But many victims say those who replaced him are yet to deliver justice.
Al Jazeera’s Hiba Morgan reports from Khartoum.
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شاهد فيديو Sudan: One year since crackdown government yet to deliver justice على قناة Al Jazeera English حصريا على موقع فيديوهات لكم.