It happened at the Derwent Valley Industrial Estate, Dunnington in the early hours of the morning of Thursday 31 August when two HGVs were involved in the theft of over 20,000 litres of fuel.
North Yorkshire Police are appealing for information about any persons/vehicles seen in the area at this time or any information which may assist our enquiry.
Anyone with information that could assist the investigation should email Eleanor.stevens@northyorkshire.police.uk.
You can also call North Yorkshire Police on 101, select option 2, and ask for Eleanor Stevens.
If you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111.
Please quote the North Yorkshire Police reference number 12230164342.