An industrial unit at Link Park in Chickerell, which is still being built and around 80% complete, was broken into on the night of Sunday 30 July and Monday, 31 July.
Police said the offenders gained access through the perimeter fencing around the site and caused damage to machinery and tools as well as the walls of the unit, glazing panels, tiles and fittings. Fire extinguishers were also let off and paint tins were opened and the contents thrown around.
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It is estimated the clear-up and repair operation alone is likely to cost the building firm several thousand pounds.
Police Constable Ryan Lloyd, of Weymouth police, said: "These mindless acts of vandalism will cost the firm involved a considerable amount of money and caused a major inconvenience.
"I would urge any witnesses to the incident, or anyone who has seen any suspicious activity around the site on the nights in question, to please contact me."
(LM/MH)
