Gardaí and the Irish Coast Guard resumed their search of Sliabh Liag at first light this morning.
It followed reports yesterday that a person had gone missing in the area.
Access to part of the cliffs have been cordoned off as a result of the search.
No identity of the missing person has been released by Gardaí.
In a related development, they have also sealed off a house in the Killybegs area. Forensics officers have entered the house and a search is being conducted.
The Gardai and the Rescue 118 helicopter from Sligo are also involved in the search as are members of the Donegal Mountain Rescue Team.
However, Gardai are remaining tight-lipped about the nature of the search.
A spokesperson said they had no further details in relation to this investigation and that when updates are available, they will provide same.
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