A Sudanese civilian detained and allegedly tortured by security agents in a central town has died in custody.

The doctors committee said in a statement that the man died in the town of Dilling in the state of South Kordofan after he was detained by agents of the feared National Intelligence and Security Service, NISS.

Rights groups and activists had regularly accused security service agents of cracking down on dissidents and restricting freedoms during the regime of veteran leader Omar al-Bashir who was ousted in April.

It was National Intelligence and Security Service that led a sweeping crackdown on protests against Bashir’s rule that first erupted in December.

Dozens were killed and hundreds of protesters, activists and opposition leaders were arrested during the months-long campaign that led to Bashir’s overthrow and subsequent demonstrations calling for civilian rule.