Thieves stole keys and a lorry from a Northampton business during two separate thefts in three nights.
Police are appealing for witnesses after thieves forced open a window at JD Pipes in Weedon Road Industrial Estate and stole a safe full of keys, before later returning and using their haul to steal a lorry.
The Leyland DAF lorry was driven around and then abandoned near the premises.
The theft of the key safe took place sometime between 6pm on Friday, June 5, and 2.30am on Sunday, June 7. The lorry was then taken overnight between Sunday, June 7, and Monday, June 8.
Witnesses, or anyone with any information, are asked to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.