Quad bike owners have been warned to remain vigilant following a spate of thefts during the Christmas period.
Dyfed-Powys Police has reminded farmers and other owners of quad bikes to be weary of suspicious vehicles and people in their community and to report any concerns to police.
Superintendent Robyn Mason, rural crime lead for Dyfed-Powys Police, said: "I ask that local farmers and other quad bike owners take appropriate action to minimise the opportunities of these thefts occurring. This includes removing keys from ignitions after use, locking barns or outbuildings wherever the quads may be kept.
"I'm aware that thefts of quad bikes and farming machinery causes disruption to farmers' work, as well as the financial implications, and I would like to reassure the public that the police are thoroughly investigating these matters.
"I encourage anyone living in rural communities to remain vigilant to this type of theft, and to report any suspicious vehicles or behaviour to police by phoning 101."
The force said it received four reports of stolen quads in the Carmarthenshire area during Christmas week.
Advice for owners includes to avoid leaving quads in fields, especially near roads, and keeping a record of any chassis or serial numbers as well as using security marking kits and fitting a tracker or immobiliser.
Dyfed-Powys Police said websites such as www.immobilise.com and www.tereurope.org are useful international online databases to record serial numbers for a wide range of vehicles and property.