Dyfed-Powys Police is investigating a spate of thefts occurring through Facebook Marketplace in the Pembrokeshire and Ceredigion areas.
A total of 5 motorbikes and an E-bike have been reported as stolen between February 4 and 18.
All incidents were reported to have taken place either early hours or late at night.
Three men have been arrested and released on bail awaiting further police investigations.
Suspects are making contact with sellers who have advertised motorcycles for sale.
They engage in conversation pretending to be a genuine buyer to receive the seller's address to view/purchase the bike.
Shortly after these details are shared, the motorbikes are stolen.
We would like to advice those currently or thinking of selling a motorbike via Facebook Marketplace to:
Choose a public location for the exchange/viewing
Avoid suspicious accounts that have been recently created or seem incomplete
Use secure payment methods