A 48 year old police officer arrested on Tuesday 17th June as part of an investigation into the awarding of a number of PSNI vehicle contracts has been released pending a report to the Public Prosecution Service.
He has now been suspended from duty.
A 71 year old civilian arrested in County Down on Thursday 19th June remains in police custody.
Earlier today, two men from England were also released pending a report to the PPS.
On Thursday night, former ACC Duncan McCausland was released from custody at the serious crime suite in Antrim pending a report to the PPS.
A member of the police staff was also released pending a report to the PPS.
He has been suspended from duty.