More than a dozen vehicles have been damaged in an area between the Bridge and Route Militaire.
It happened during the early hours of Saturday 5 May along Lowlands Road and Saltpans Road in St Sampsons.
The reported damage consists mainly of damaged wingmirrors with one vehicle having a smashed windscreen and windows.
Guernsey Police said officers "would be keen to speak to anybody who can provide any information in relation to the damage being caused."
A large group of young people were seen in the area at around the time the damage was caused and officers are particularly keen to speak to them.
Guernsey Police also said they "would urge anybody in the area to check their vehicles for any fresh damage and if anybody has any private CCTV they would be willing to check or have an Officer check that would be appreciated."
Anyone with any information should contact PC 137 Drummy or PC 100 Simon on 725111 or Crimestoppers anonymously on 0800 555 111.
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