A person has been arrested on suspicion of drug dealing offences in Bicester.
The arrest occurred in Bure Park Nature Reserve in the north of the town.
The person was held on suspicion of supply of Class B drugs.
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Thames Valley Police conducted cycle patrol in Bicester last night (July 6).
They warned on Facebook: "If you deal drugs in Bure Park Nature Reserve we will find you and we will arrest you!"
Bure Park Nature Reserve is a 8.4 hectare green space.
It is home to several important species and habitats, including great crested newts which can be found in the pond.
The River Bure runs through the nature reserve.
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