An extensive search of difficult terrain has failed to throw up any clues to the whereabouts of a missing Canterbury man.
Search and rescue teams have been searching a large area of Whitecliffs over the last four days in the hope of finding Raymond Neil Finnie, 74.
Mr Finnie is commonly known as Neil, and was last seen driving his silver 2013 Suzuki Swift on September 25.
His car was found in the Whitecliffs area on Wednesday.Sergeant Phil Simmonds of Canterbury search and rescue said land and aerial searches covering a 3-4km radius of where Mr Finnie's vehicle was found have been carried out.
"The challenging terrain extends from heights of 300m up to 900m and unfortunately he has not been located despite in excess of 1100 man hours spent searching the area for him over the last four days."
Police are now reviewing the search data and information provided by the public.
"Fliers have been put in mailboxes in surrounding properties, but due to the school holidays not all home owners have been spoken to.
"We urge anyone living, or who owns land, in the Whitecliffs area to check their outbuildings and properties for any sign that he may have travelled through the area."
Mr Finnie was wearing dark trackpants and a dark woollen jersey when he was last seen, but may have had a change of clothes with him.
He has recently suffered a stroke and may have appeared disoriented.
Police said they and Mr Finnie's family have serious concerns for him.
If you know where Neil is or have seen him in the last week please contact Christchurch police on 03 363 7400.