Runners from Sheffield have taken part in the search for a former club member who vanished last week.
Nicholas Harper, a 50-year-old student teacher, was last seen on Thursday, February 7 when he left his home in Pickering, North Yorkshire, for a work placement.
But he failed to arrive and a police search was launched.
His car was later found at Cowhouse Wood, north of Helmsley.
Nicholas was a member of Totley Athletics Club when he used to live in Sheffield.
Members of the club have taken part in searches for their friend, who was a popular member of the club during his time there before he moved away from the city.
Inspector Dan Spence, of North Yorkshire Police, said: “We remain very concerned for Nicholas’ safety and are continuing our searches.”
He said police officers, volunteer search and rescue teams, police dogs, drone cameras and the National Police Air Service helicopter have been used in the search so far.
Nicholas is an ‘ultra runner’ who can run long distances.
He is white, 5ft 5ins tall and of a stocky build with dark short, brown hair and a full beard.
He was last seen wearing a three piece suit and shirt but his family has released a photograph of him in a blue coat which he may be wearing.