Volunteers join search for missing man Graham Johnstone
Volunteers have joined in a full-scale search for a 70-year-old man who went missing in South Ayrshire on Friday.
Air and foot searches have been carried out around walkways in the Annbank and Auchincruive Estate area since Graham Johnstone went missing at about 10:40.
A police dog unit and rescue helicopter are involved in the operation.
Mr Johnstone's family reported him missing after he left his home in Whitehill Crescent, Annbank, and failed to return.
Police said Mr Johnstone enjoyed walking along local river walks and routes, and although he was in good health, his family was "extremely worried".
He is about 5ft 8in tall, with grey, slightly balding hair. He is clean shaven and wears glasses.
At the time of his disappearance, he was wearing a black zipped top, beige trousers and a fawn cardigan.
An extensive search was undertaken around Oswald Bridge after a man matching Mr Johnstone's description was seen at about 11:45 on Friday.
He was wearing walking boots and carrying what may have been an olive green hat or balaclava.
The sighting has not been confirmed and police are trying to ascertain if it was Mr Johnstone.
They are appealing to walkers who were in that area on Friday to contact them.