A van containing almost €3M of cocaine found in Kilmacrennan earlier this week may have been left there for up to 10 days.
Sources say the van, which was lined with 41 kilogrammes of the drug, was either abandoned or left to “cool” at the scene.
The van was reported by a suspicious local after it was parked up for more than a week.
It is understood the plan was to leave the van there for a number of weeks before returning for the haul.
Gardai opened the van and were shocked when they pulled back some panels in the van to discovered the drugs haul.
It is understood to be the biggest ever drugs find by Gardai in the county.
There is speculation that the van was brought into Donegal via the North by ferry before being dropped off.
It is understood that the haul may have been destined for the North.