Gardai and Department of Agriculture officials have raided a farm on the outskirts of Letterkenny.
The raid has taken place in the past two hours.
ESB maintenance officials are also on the site of the farmland which is also close to Newmills.
Gardai are remaining tight-lipped about the operation.
No arrests have been made but Gardai remain at the scene.
However, Donegal Daily understands the operation is connected to the disposal of animal carcasses.
It is also understood that ESB officials are examining ESB connections on the farm as part of their visit to the site.
We will bring you more o this story as we get it.Tags: