Thieves smashed a glass pane before taking jewellery from the bedrooms of an unoccupied property in Bury St Edmunds.
The incident happened at some point between 3pm on Sunday, December 2 and 1.45pm on Sunday, December 9 on Raedwald Drive.
The unknown offenders entered a secured and unoccupied property by smashing the conservatory door.
They then searched the bedrooms on the first floor and left with jewellery.
Any witnesses to the incident, anybody with information or people who were in the area at the time are asked to contact Bury St Edmunds CID at Landmark House on 101, quoting crime reference 37/71193/18
Alternatively people can contact the charity Crimestoppers anonymously on 0800 555 111.
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