Police are appealing for witnesses after red diesel was stolen from a farm near Topcliffe.
Thieves took a quantity of fuel from a tank at Grange Farm just off the northbound carriageway of the A168 sometime between 12.30pm and 3.30pm on Monday 7 October 2013.
Following the theft the offenders left the tap to the tank open and some of the diesel spilled out into a nearby beck.
Officers are appealing to anyone who saw any suspicious people or vehicles in the area around the time of the incident to get in touch.
PC Quita Passmore, of Thirsk police, said:
I am appealing to any motorists to try and remember if they saw anything that stood out to them on Monday afternoon. Did you see any vehicles pulling in or out of the farm?
I would also like to remind people that spilling diesel into waterways is very harmful for local wildlife.
Anyone who can help officers with their enquiries is urged to contact North Yorkshire Police on 101 – select option 2 – and ask for Quita Passmore or Thirsk police.
Alternatively, information can be emailed to email@example.com
If you prefer not to give your name, Crimestoppers can be contacted anonymously on 0800 555 111.
Please quote reference number 12130174436 when passing information about this incident.