Searches of the Upper Dales resumed this morning in and effort to locate a missing 80- year-old walker.
Harry Harvey, of Tynemouth, was reported missing at 1.30pm yesterday.
He was on an organised walking trip with a group when he disappeared, possibly after getting lost en route.
Police, search and rescue teams and the RAF Search and Rescue Team are all conducting further land searches today, starting near the Tan Hill Pub.
Harry was wearing a dark coloured jacket and trousers, walking boots and carrying a large dark rucksack containing all of his camping and hiking gear including his tent.
Inspector Mark Gee, of North Yorkshire Police, said: “We are extremely concerned for Mr Harvey’s welfare.
“Despite being an experienced walker, Harry has been missing for a long time now, in wet conditions and cold wind.
“We are appealing for residents and workers in the area to check outbuildings, sheds and barns, as he may have taken shelter in there.
“Harry was carrying all of his camping equipment with him, so we are also appealing to anyone who has seen a discarded tent or hiking gear to get in touch.”
Anyone who thinks they might have seen Harry or who has any information is asked to contact police immediately on 101, quoting reference number 12200156224.