Kganyago explained that they cannot divulge the number of witnesses in the case. This is to avoid the possibility of people working together to intimidate witnesses.
The raid at their Centurion offices relates to a R130 million contract relating to training of security personnel, election observers and computer lessons.
The South African Police Union (SAPU) says the criminal charges against suspended National Police Commissioner General Fannie Masemola were politically motivated and put national security at risk.