Police searching for pensioner Roger Fletcher, who has been missing in Wester Ross since Sunday, yesterday launched a poster campaign in the area.
The 77-year-old was last seen at around 8.30am when he set off from a holiday home in Bundalloch, near Dornie, for a walk.
The alarm was raised when he failed to return.
Extensive searches of the area have been carried out by police officers, police and SARDA dogs, Kintail and RAF Mountain Rescue Teams, a Coastguard search and rescue helicopter and Coastguard ground teams.
Police officers were yesterday carrying out further searches of the Dornie and Bundalloch area, where he was believed to have been hillwalking.
And the posters, bearing a photo of Mr Fletcher and his description, are being put up in the Dornie, Kyle and Glenshiel areas in the hope they will jog someone’s memory.
A police spokeswoman said: “As time goes on, we are becoming increasingly concerned for his welfare.
“We are hoping to get more mountain rescue personnel out at the weekend, if he has not been found by then.”
Mr Fletcher has white hair, wears glasses and walks with a stoop.
He uses walking poles and is understood to have been carrying a small, khaki-coloured rucksack.
Police received reports of a man matching Mr Fletcher’s description walking along the A87 approximately four miles west of Cluanie, in the Glenshiel area, at around 7pm on Sunday.
The spokeswoman said they had received a good response to their appeal for information about this possible sighting, but had so far been unable to identify the man.
Meanwhile, walkers Goffredo Bondanelli, 56, Eric Cyl, 62, and Tom Brown, 65, remain missing in the Lochaber area.
Mr Bondanelli was last seen in Fort William on Tuesday, May 3, boarding a train to Lochailort, before undertaking a 21-mile walk between Lochailort and Glenfinnan. The German national planned to return to Glenfinnan on Sunday May 8.
The police spokeswoman said: “Searches for Mr Bondanelli will be resumed as and when searchers are available.
“Our searching is concentrated on Dornie at the moment.”
Mr Cyl was last seen heading for the Ring of Steall in the Mamore range on May 30 last year and Mr Brown, 65, set off alone in Glen Nevis on July 2 last year.
Police continue to appeal to anyone walking in the Mamore Range to report anything that may assist them in tracing these men.
Anyone with information that could help police with their inquiries into any of these missing people is asked to contact them on 101.