Specialist drones were brought in last week to help search for a missing Dumbarton man.
The equipment, which gives a view from the sky, was in action at Levengrove Park as part of the hunt for George Sutherland.
The last confirmed sighting of 45-year-old George was at around 8.45pm on Sunday, March 8, near to Dalreoch train station.
Police later issued a CCTV image of him there.
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But no trace of him has been found, despite the searches.
Sergeant Brian Simpson of Dumbarton police told the Lennox Herald: “Extensive enquiries have been carried out and are still ongoing.”
Inspector John Forrest added: “George was last seen on CCTV near to the train station and we are keen to trace his movements prior to and after this.
“It is unusual for George not to be in contact with his family and we are appealing for anyone with information which may help to trace him to get in touch.”
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Anyone with information can contact police on 101.
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