Pc Matt Jenkins security marks Danielle Collinson's bike during a security advice session in Bicester.
Police and security firms were in Market Square on Saturday, August 30, giving advice and postcode marking people's property for free.
In the past two months bicycle thefts have have almost trebled in the town compared with the same period last year.
In July and August 40 bicycles were stolen in the town compared with 14 last year.
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