Helicopter search for missing man Brian Martin in Dundee
A helicopter with thermal heat-seeking equipment has been used to search for a missing man in Dundee.
Brian Martin, 30, was last seen at a friend's home in Wentworth Drive at about 07:45 on Friday, 10 January.
Police said no-one had heard from him since then, and that concern was growing for his safety.
Officers want to hear from anyone who has seen Mr Martin, who is 5ft 7in tall, of slim build, with short brown hair and green eyes.
He was last seen wearing a woollen tammy with a badge on the front, a red, grey and black waist-length jacket, blue jeans and grey trainers.
He may also be in possession of, or wearing, green camouflage trousers and top.
Ch Insp Conrad Trickett said the Police Scotland helicopter had used heat-seeking equipment to search the Templeton Woods and Camperdown areas of Dundee on Wednesday.
These are both areas where Brian has been known to sleep rough in the past.
''Officers have also been out and about visiting places that Brian has been known to go and speaking to people he knows in a bid to establish where he might be," he said.
"Posters have also been placed in various shops appealing for information as to his whereabouts."
He said Mr Martin was known to sleep rough and travel throughout Scotland picking up farm work, most recently in the Inverness area.
However, he would always keep in regular contact with his family, particularly his pregnant sister, who is due to give birth in the next few days.
"She is distraught that Brian may miss the special family occasion and desperately wants him to get in touch," added Ch Insp Trickett.
"I would appeal to anyone who knows his whereabouts, or who has seen him in the last few weeks, to get in touch with us.''