Goods worth several thousands of pounds were stolen from an antiques shop.
The raid at Span Antiques, in Market Place, Woodstock, took place between Saturday evening and Sunday morning.
The shop is a base for 11 antique dealers and items stolen include art deco and silverware.
Det Con Mark Rudman said: "At this stage we don't know how much has been stolen.
"We believe this could have happened on Saturday evening when Woodstock is a busy place. A passer-by may have heard a widow smash or seen someone acting suspiciously near Span Antiques."
Anyone with any information should contact Kidlington police station on 01865 846955.
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