In a “horrific incident,” three sheep have died and eight others have been reported missing.
A vehicle, possibly a 4X4, entered a field at Surfleet Marsh, in between Surfleet and Fosdyke, and ran over three of the resident sheep.
One sheep died as a result of the collision and one of the other two injured sheep was set on fire while it was still alive. This sheep, along with the other injured sheep had to be put to sleep.
The incident took place between Friday 17 July and Saturday 18 July.
Investigating Wildlife Crime officer PC Martin Green said: “This is a horrific incident that has caused much upset to the farmer. Unfortunately, we do believe this was a deliberate act and we are carrying out investigations to bring the offenders to justice.
“We believe a 4X4 was driven into the field where the sheep were kept sometime between Friday and Saturday. Three of the flock were knocked down and have sadly died.
“The farmer has also reported that eight sheep are missing. We believe these eight sheep may have been chased into the River Welland or they may have been stolen.
“We would like to hear from anyone who may be able to assist with our investigation. Any information no matter how insignificant it may seem, may help us to investigate this cruel act and identify those responsible.”