A spindle whorl, believed to be medieval, has been found at Philihaugh in Selkirk.
Workers from Scottish Water unearthed what could be remains of an ancient medieval village whilst carrying out water works.
Archaeologists are now working to discover how large the site is and how far the remains date back.
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The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.
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