GWENT Police is re-appealing for information to help locate Jon Marc Stephens who failed to return to HMP Prescoed.
Stephens, who has convictions for robbery, was on day release on September 22 and did not return at the allotted time.
A police spokesman said: "Stephens is described as 5 feet 9 inches tall, of slim build with short dark brown hair. He is not a sex offender.
"It's believed there may be a potential risk due to the fact that he is no longer in the custody of the prison service.
"Gwent Police has activated its operational plan with the aim of locating him and the prison is co-operating fully with us."
Anyone who sees Stephens or has any information about his whereabouts is advised not to approach him but to ring Gwent Police on 01633 838111 quoting log 456 22/09/13.