A blue Mazda MX5 has been damaged at the Odeon Car Park.
The damage has been described by investigators as a "large deep scratch" along the passenger side of the vehicle.
It happened sometime between 10:30 and 18:30 on Thursday 12 August.
Pictured: A close-up of the damage to the Mazda.
Police are appealing for information or any private CCTV/dash camera footage.
Anyone who can assist the investigation is asked to contact Guernsey Police on 222 222 or to contact CrimeStoppers anonymously on 0800 555 111.
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