Officers have released CCTV footage of missing north-east teenager Liam Smith.
The footage was captured at Union Square shopping centre on Saturday and shows the distinctive way in which the 16-year-old walks.
It was captured shortly before Liam boarded a 202 Stagecoach bus at 1.11pm.
It is understood he bought a ticket for Raemoir Road in Banchory and police activity has focused on this area today.
Chief Inspector Martin Mackay said: “Our last confirmed sighting of Liam is at the bus station in Aberdeen on November 17, and we are continuing to urge anyone who was in that area or who was on the 1.11pm 202 bus to Deeside to contact us.
“The bus would have made a number of stops at towns and villages including Cults, Peterculter, Drumoak, Crathes and Banchory and we are urging anyone who may have got on the bus at any of these stops or was perhaps meeting someone off the bus and saw Liam to contact us.
“It is hoped that by releasing the moving images of Liam which shows his distinct gait that this helps jog people’s memories and think about if they saw him on Saturday.
“Saturday was a busy day in sport with the Scotland v South Africa rugby match and also Scotland playing Albania in the UEFA Nations League.
“We would hope that people may have an enhanced memory of their plans that day and if they were travelling in or out of Aberdeen city centre they might remember seeing Liam.
“We know Liam is interested in sport and has played football with Westdyke, Banks o’Dee, Dyce Boys Club, Culter Boys Club and Glentanar.
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“He is also a member of PureGym. It might have been that Liam was planning to meet friends or spoke to someone about the upcoming games and we would urge anyone who was in touch with him to contact police.”
Police activity is focusing on the Raemoir Road area with the aim of establishing that Liam got off the bus there. Officers will be in the area speaking to members of the public and checking CCTV of local shops.
Chief Inspector Martin Mackay added: “We would urge anyone who lives in the Raemoir Road and surrounding area and has private CCTV to please check it for any sightings of Liam particularly on Saturday afternoon.
“Anyone with information should contact police on 101 using reference number 1302 of 18 November.
“We are very grateful to everyone who has contacted police so far and supported us with enquiries.
“Naturally Liam’s family is extremely concerned and we just want to trace him as soon as possible to ensure he is safe and well.”
Liam is described as white, 6ft 4ins tall and of slim build.
He has short brown hair and when he was last seen he was wearing a dark top, blue jeans and Nike Air Max trainers. He is also understood to be carrying a camouflage North Face backpack.