Two Gauteng police station commanders are the latest to be arrested in connection with alleged gun licence fraud.
The two brigadiers were arrested on Tuesday, joining a host of co-accused who have already appeared in court.
They include alleged underworld boss Nafiz Modack and current and former police officers.
National police spokesperson Brigadier Vish Naidoo said the two senior officers were arrested by the Western Cape Anti-Gang Unit, who were assisted by the National Anti-Corruption Unit.
"The brigadiers have been arrested for their alleged involvement in fraud, defeating the administration of justice and contravention of the Firearms Control Act in multiple case dockets in the areas of Edenvale, Kempton Park and Norwood in the province of Gauteng.
"The arrest of the two brigadiers brings to 28 the total number of people arrested in connection with these cases after 26 people were arrested earlier this year. Of the 28 suspects, 17 are police officers, of which two are retired, and 11 are civilians.
"These investigations started three years ago when it emerged that, during November 2017, security companies were involved in crimes of extortion in the Western Cape province relating to firearm applications in Gauteng," said Naidoo.
He said that, in January 2018, several other people, family and friends in Cape Town obtained their competency and licence to possess a firearm, as well as temporary authorisation to possess a firearm, in an allegedly fraudulent manner.
The applications were all made in Gauteng, more so at the SAPS in Edenvale, Norwood and Kempton Park.
"Information was received that the applicants would go to a gun shop in Kempton Park, where they would do a proficiency test to make an application for competency to possess a firearm and ammunition."
The two senior officers are expected in the Kempton Park Magistrate's Court on Wednesday.