A 28-YEAR-OLD man and a 27-year-old woman who were arrested on Tuesday on suspicion of the murder of Kyle Vaughan have been released on bail pending further enquiries.
Mr Vaughan, 24, from Newbridge, has been missing since December 30.
Since his disappearance eight people have been arrested in connection with the murder investigation.
Gwent Police said the man and woman, who are from the Cwmfelinfach area, had been released on Friday evening.
Police had been granted an extention to question the pair until Thursday evening.
Mr Vaughan has been missing for more than three weeks.
The last sighting of him was on the A467 between Risca and Crosskeys, some time between 11pm and 11.45pm on Sunday December 30 2012.
It is believed he was wearing a dark coloured beanie hat, a dark coloured t-shirt, 3⁄4 length denim shorts, white trainers, and a gold chain.
On the same night at approximately 11.45pm, officers found Mr Vaughan's car – a silver Peugeot 306 – which had been involved in a collision.
Detectives are continuing their enquiries into the disappearance.
Anyone with any information should call 101 or Crimestoppers anonymously on 0800 555111.