Thieves stole outboard engines from two boats which were moored at Blakeney Quay during the weekend.
Both thefts happened between 9am on Saturday and 12.30pm the following day.
Boat owners are advised to be vigilant, remove valuables and report any suspicious behaviour to the police.
Anyone with information should contact PC Jason Pegden at Wells police station on 0845 4564567 or Crimestoppers anonymously on 0800 555111.
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