Mr Faisal, a member of the civilian coalition Forces of Freedom and Change (FFC), had been part of a committee before the coup working to dismantle the regime of Omar al-Bashir and seize assets that were looted during his presidency. The long-time leader was overthrown after mass protests in April 2019.

Several other members of the committee have already been arrested on corruption charges.

On Monday, the security forces raided the offices of another independent committee that was investigating the shooting dead of more than 100 demonstrators in June 2019.

Correspondents say Sudan's military rulers appear to be undoing most of the reforms carried out after the overthrow of Mr Bashir.

In recent months, dozens of protesters against military rule have been killed by security forces and thousands injured in an ongoing wave of anti-coup demonstrations that swept the country since the military takeover.