Police say they are still conducting "extensive inquiries" into the disappearance of a man who has not been seen since last Friday.

Police are concerned for the welfare of Richard Davies, 39, from Blaenavon, south Wales, who went missing after a night out with colleagues in Cardiff.

Officers are viewing CCTV tapes from one club and other premises in Cardiff city centre in an effort to track Mr Davies's movements.

Crowds

Gwent police are liaising with South Wales Police as part of the investigation but said that there were more than 200,000 people in the city last weekend, making it particularly difficult to trace Mr Davies.

Officers added that they are keeping an "open mind" about what might have happened to Mr Davies and are urging anyone with information to come forward.

He failed to return home since becoming separated from friends shortly before 2300 GMT last Friday.

Meanwhile, South Wales Police are investigating reports that a man was seen in the River Taff near the Millennium Stadium at around the same time.

Detectives are not linking the two cases but have not yet ruled out the possibility that they may be related.

The family of father-of-two Mr Davies say his disappearance is out of character and they are worried about his safety.

Concern

His wife Michelle, and children, Justin, 13, and Charlotte, 10, are left at home waiting for news about him.

Gwent Police said he left home at 0900 GMT last Friday morning for the trip with a group of friends.

They first went go-karting in Newport at midday then caught the 1600 GMT train to Cardiff where they drank at a number of city centre bars and pubs until around 2300 GMT.

Missing

Officers said there was no disagreement among the group and that Mr Davies was not seen to have left with anyone else.

He was last seen at a bar called Reflex in St Mary St.

He was wearing navy trousers and a light blue shirt during the time he went missing.

Mr Davies is described as being 5ft 11 inches tall, of medium build and has brown hair.