The specialist dog team is the only one of its kind in the UK
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A specialist dog search team from the Metropolitan Police is continuing the search for the body of a missing teenager in County Tyrone.
Arlene Arkinson was 15 when she disappeared nine years ago near her home in Castlederg.
The team are concentrating on a field at Mill Dam just outside the town.
The team is the only one of its kind in the UK and was recently involved in the search for missing Londonderry man David Harrison in Ballygawley.
Members of Arlene's family are watching the search operation and say they are hopeful that she will be found.