Twenty three Mercedes Sprinter vans have been stolen in Norfolk since the start of January - that's an average of two per week.
Eighteen of them have been stolen from Great Yarmouth and the nearby area, although some thefts have been further afield.
The vehicles have been targeted when parked in residential areas and carparks overnight.
They've also disappeared from Broadland, South Norfolk and Kings Lynn.
Police are warning van drivers to remain vigilant after the spate of thefts, urging us to ensure our vans are secure and that no valuables have been left inside them.
The majority of the vans were taken without the keys, with police believing thieves have been replacing the engine control unit (ECU) in order to drive the vans away.
Chief inspector Nathan Clarke of Norfolk Constabulary said: I would urge anyone who owns a Sprinter van to be vigilant and take sensible measures to protect your vehicle.
"If it’s an option, keep your van parked overnight in a secure compound. If you park on a residential street, try to park in well-lit areas.
"Mechanical locking devices, such as steering or gearstick locks and wheel clamps, could also help to deter thieves.”
Anyone who may have information about the vehicle thefts should contact Norfolk Constabulary on 101 or via Crimestoppers anonymously on 0800 555 111.