Four trucks contracted by Dominion Salt Works during harvest have been vandalised in a serious criminal attack, police say.
The large dump trucks, belonging to a private contractor believed to be from the West Coast, were hit at Grassmere, south of Seddon, overnight on Wednesday.
A police spokeswoman said superglue was put in the trucks' door locks, tyres were slashed, radiators were punctured and brake lines cut.
Offensive messages were also sprayed with paint on the cabs of the trucks.
"This is not just wilful damage," she said.
"It's criminal damage that was very intentional."
The damage caused by the vandalism is estimated at more than $25,000, she said.
The four trucks were parked in an open area of the salt works.
Marlborough area commander, Inspector Simon Feltham, said the attack was between 6pm on Wednesday and 7am yesterday. Police are trying to establish what motivated the offender, Feltham said.
He understood the owner of the trucks regularly contracted to the salt works during the salt harvest. He did not know anyone who had a grudge, Feltham said.
"It's quite an unusual incident," he said.
"It's well away from the main road, so someone had to travel there, which suggests quite a motivated offender rather than random vandalism."
Police are keen to hear from anyone who has information about the attack or about someone who might have had motive to commit the offence.
Anyone with information or who was in the area and saw something suspicious is asked to contact Constable Brett Burns at Blenheim police on 03 578 5279.
Or call Crimestoppers on 0800 555 111.
The Marlborough Express