The incident happened in the early hours of this morning (12/11).
A Thames Valley Police spokesperson told us the offenders used two vans to break into Kasim Jewellers on Buckingham Street shortly after 3am, stealing jewellery and watches before leaving.
The offenders are described as wearing dark/black clothing and driving one white and one grey Ford Transit vans, as well as a red Audi estate car.
Police say the investigation is ongoing, with a scene in place, and that they won't tolerate this offending in their patch.
They're also asking the public to send any material to them rather than sharing it online.
Anyone with information or footage is encouraged to call 101 or make a report on Thames Valley Police's website, quoting reference number 43260591374.
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