A former PSNI senior officer, who was arrested for questioning about the awarding of police vehicle contracts in Northern Ireland, has strenuously denied the allegations.

Duncan McCausland, who was an assistant chief constable until his retirement in 2011, was released from custody last night after three days of questioning.

He was released from Antrim police station, pending a report being sent to the Public Prosecution Service (PPS).

"I am going out of my way to ensure I can prove my innocence," he said.

He was one of seven men arrested on suspicion of bribery and misconduct in public office.

Two of the suspects were arrested in England and brought to Northern Ireland for questioning.

A civilian PSNI worker has been suspended from duty after also being questioned and released pending a report to the PPS.