Police are asking racehorse trainers and people who work in the industry to review the security of their homes and businesses.
A spokesman said:
We have arrested one local man and are actively seeking at least two others.
We believe we have disrupted the intentions of these people to steal or rob.
We ask for people to be vigilant, take sensible precautions and to report any suspicious activity to the local police.
The investigation remains ongoing.
Anyone with information about suspicious activity should contact North Yorkshire Police on 101.
Details can also be passed on to Crimestoppers anonymously on 0800 555 111.