Thousands of pounds worth of jewellery was stolen from two neighbouring houses.
The burglaries happened sometime between 9am and 3.30pm in Leys View, Langford, near Faringdon, on Tuesday, February 16.
Burglars stole cash, watches, rings, bracelets and earrings worth more than £3,000.
Anyone with information should call police on 08458 505505 or Crimestoppers on 0800 555111.
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