Police are appealing for witnesses after five catalytic converters were stolen from the Bury St Edmunds area.
The first three took place in Bury overnight between September 3 and September 4.
The vehicles targeted included a Seat Alhambra in Sandholme Close, a Toyota van in Starre Road and a Seat Alhambra in Home Farm Lane.
The fourth theft, involving a Peugeot Boxer camper van, happened in The Sewells some time between August 26 and yesterday.
A Mitsubishi L200 pick-up truck was also targeted in Fulford Close, Fornham St Martin, between August 31 and September 6.
Anyone with information is asked to contact Bury police on 101 or Crimestoppers, anonymously, on 0800 555 111.
A catalytic converter marking event will take place this weekend to help motorists to prevent theirs from being stolen.
The day is aimed primarily at owners of vehicles with a high ground clearance, such as vans and 4x4s, which tend to be targeted by thieves due to the ease at which they can get underneath them.
The catalytic converters will be etched with the vehicle’s registration number and also marked with an heat-resistant silver spray, which acts as a deterrent to thieves and identifies it to scrap dealers as one that has been marked.
Vehicle owners will also be given stickers to place in their windows warning potential thieves that the converter has been security protected.
The marking, which is offered free of charge, will take place between 9am and 4pm on Saturday at the Volkswagen dealership in Northern Way, Bury.
No appointment is necessary but anyone who would like further information should contact PCSO Matt Smitth or PCSO Alex Oliver on 101.