Chief Constable of Dumfries and Galloway Police, says the investigation into the Lockerbie bombing 'has reached a new level' and that the force hopes to build on what was learnt by officers who travelled to Libya last week.
Patrick Shearer spoke exclusively to ITV News.
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Detectives say the men have shown "no remorse for their actions whatsoever".
So far, they've removed more than 20,000 tonnes of gravel.
The festival is one of the longest running Blues festivals in the country.