Police are appealing for witnesses following a considerable amount of damage to a business at the La Collette Reclamation site.
At least eight specialist works vehicles and three portacabins have been vandalised overnight, causing an estimated £250k worth of damage.
Two vehicles had also been moved around the site, which meant significant damage was caused by the fact they became submerged in the rising tide.
Officers were called just after 7am this morning, and forensics officers have, and will be at, the scene for much of the day.
CID officers are leading the investigation and are appealing to anyone with information to contact them on 612300 or Crimestoppers anonymously on 0800 555111.
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