Gardai are investigating an incident at the shore front car park in Dungloe overnight.
It’s believed a man in his late 20s, sustained serious injuries after he fell from the cab of a truck.
He was taken to Letterkenny University Hospital but has since been transferred to Dublin for further treatment.
The scene is currently cordoned off awaiting a technical examination.
Gardai are appealing for witnesses anyone with information is asked to contact Dungloe Garda Station on (074) 952 1000 or Milford Garda Station on (074)9153067.
There are no further details at this stage.