Snowdonia search for Gerry Coyle, 65
Police have appealed for sightings of a walker, who was last seen on the summit of Snowdon.
Gerry Coyle, 65, from Rugby, Warwickshire, was last spotted last Thursday lunchtime at the mountain cafe.
It is believed he took the mountain railway to the top after leaving his hotel, although he planned to walk up.
Police want to speak to mountain walkers who may have seen Mr Coyle in recent days.
Mr Coyle is believed to have left the Padarn Lake Hotel in Llanberis at about 11:00 BST on 25 October, saying he intended to walk to the top of Snowdon.
But because of a text he sent to his wife it is believed he took the train to the summit instead. He was last seen at about 13:00 BST in the summit café.
Detectives said Mr Coyle has failed to make contact or respond to calls from his family and friends.
North Wales Police supported by the RAF Mountain Rescue and helicopter, North East Wales Search and Rescue (Newsar) and Search and Rescue Dog Association Wales (Sarda) have been searching the area after they were alerted on Saturday.
Sgt Rob Rands said "Mr Coyle left the hotel stating his intentions to walk to the summit and indeed upon speaking with staff there it appears he made it.
"However, he has not been seen since and with the passing of time, and the deteriorating weather conditions, we are increasingly concerned about his safety.
"I am appealing to anyone who has been walking the mountains of the last few days that if you have seen Mr Coyle to make immediate contact with the police"
Mr Coyle is 5ft 3ins tall, of medium build and bald with short, greying hair on the sides and a grey beard. He was wearing a green fleece and trousers and a wide brimmed hat with a camouflage pattern.
It is also thought Mr Coyle would have been carrying photography equipment including a tripod, although this would probably have been in a black bag or a backpack.
North Wales Police said anyone with information should contact on 101 or Crimestoppers on 0800 555 111.