A large quantity of industrial magnets have been taken from Heygates Flour Mill in Bugbrooke.
Earlier this week police appealed for witnesses to come forward to the incident which happened on Monday, June 9 at 10.30pm.
CCTV images show three offenders walking around the site prior to removing the heavy magnets from a container. These items are used in the production of flour and were due to be fitted to machinery on the site.
Police believe the offenders drove to and from the site in an old white van, possibly a Peugeot Expert or a Citroen Dispatch.
The offenders are all white, aged 30-40 and of average height. One has a stocky build with short hair, another of medium build – he was wearing glasses. The third has a slim build.
Anyone with information can call police on 101 or Crimestoppers anonymously on 0800 555 111.