An anti-corruption whistleblower is among the six people arrested in South Africa over the alleged illegal awarding of tenders by the prison department to private firm Bosasa, local media report.

Former Bosasa chief operations officer Angelo Agrizzi blew the lid on the alleged corruption during days of riveting testimony at a judge-led inquiry - only for the table to turn round against him.

The whistleblower was arrested along with people he implicated.

They include former prison boss Linda Mti, according to local media.

South Africa's elite anti-corruption unit, the Hawks, arrested the six on allegations of corruption, including fraud and money-laundering, over the awarding of tenders worth 1.6bn rand ($118.7m, £91.6m) to Bosasa and companies linked to it.

However, Legal defendants of the six have not yet commented.