A decision on the direction of the investigation into a suspected missing person off Slieve League will be taken today.
Two suspects arrested last Monday for a suspected serious assault were released from custody.
A massive search was sparked after Gardai received information that a person had allegedly been assaulted by the pair.
The suspects, a man in his 30s and a woman in her 20s, were arrested and quizzed over two days.
It followed a tip-off to Gardai by a third party who claims she had been told of an incident which led Gardai to believe that a man had been seriously injured by the pair.
The man who is allegedly missing is from Northern Ireland but was staying with the man and woman in recent days in south-west Donegal.
It is alleged that a row broke out between the three people and that the man from Northern Ireland was seriously assaulted.
The tip-off led Gardai to launch a massive search involving the Irish Coast Guard, the Rescue 118 helicopter and members of the Donegal Mountain Rescue Team at Slieve League, the setting of Europe’s highest sea cliffs.
Gardai sealed off access to the area which is normally very bust with tourists at this time of year.
Despite the extensive search over the past two days however, nothing has been found.
Last night the search was once again called off.
The various search parties were due to meet this morning to decide what action to take in the coming days.
As part of the investigation Gardaí also seized and are examining a blood splattered car.
A key part of the investigation will be forensic evidence being taken from the car suspected of being central to the investigation.
Gardai have recovered forensic samples from the car which include blood.
A warrant to examine the car was granted by Judge Brendan O’Reilly at Monday’s sitting of Letterkenny District Court.
Since then Gardai have been examining the car as they try to form a bigger picture of what exactly may have happened.
It is understood the car belongs to one of the two people who have been arrested.
A house in the Killybegs area has also been sealed off since Monday.
Forensics officers are at the house and are carrying out a search of the property.
The man and the woman, who are both natives of Co Donegal, were arrested on Sunday.
They were detained under Section 4 of the Criminal Justice Act, 1984 at local Garda stations.
The man was detained at Letterkenny Garda Station while the woman is was held at Ballyshannon Garda Station.
Gardaí are appealing to any person who may have information in relation to to the alleged assault incident to contact them.
Any road users who were travelling in the vicinity of Slieve League between Saturday evening, 24th June 2023 and Sunday evening, 25th June 2023, and who may have camera footage (including dash cam) is asked to make this available to investigating Gardaí.
Anyone with information is asked to contact Ballyshannon Garda Station on 071 985 8530, the Garda Confidential Line on 1800 666 111, or any Garda station.