The protests are taking place across the country to mark the first anniversary of a coup that halted a democratic transition.

Since the army chief, Abdel Fattah al-Burhan, seized power there have been near-weekly anti-coup marches.

The security forces have been accused of killing more than 100 protesters in the past year.

The military takeover prompted foreign donors to cut off assistance and the Sudanese economy has been in turmoil.