Officers say they are concerned for the safety of the 21-year-old, who was last seen on 7 October.
Police have made a fresh appeal for information about the disappearance of a 21-year-old County Londonderry man.
A 31-year-old woman and a 33-year-old man arrested following his disappearance were bailed on Tuesday night to allow for further enquiries.Image caption,On Tuesday, police issued CCTV images of Mr Johnston at a supermarket in the County Tyrone town about 30 minutes earlier.He has short brown hair with blue eyes, is about 5ft 9ins in height and was wearing a blue hooded top and tracksuit bottoms, officers explained on Wednesday.
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