Sudanese authorities have arrested several members of the former ruling party of ousted President Omar al-Bashir, an official of his National Congress Party (NCP) said on Saturday.

Sudan's attorney general has also asked the country's intelligence and national security agencies to lift the immunity of a number of their officers suspected of killing a teacher who died in custody after protests in February, state news agency SUNA said.

The moves appear to be part of a widening crackdown on officials from al-Bashir's administration intended to placate protesters who want the Military Council, which took over after toppling al-Bashir, to hand power to civilians.