Saudi Arabia, the UAE, Bahrain and Egypt said Wednesday they would file a complaint at the highest UN court against Qatar over alleged airspace violations.
Both sides, the quartet and Qatar, are turning to the International Court of Justice in the Hague to hear their grievances.
Saudi Arabia, the UAE, Bahrain and Egypt decided to submit the airspace case to the ICJ on the grounds that the International Civil Aviation Organisation was not competent to consider the dispute, Saudi and UAE state media said.
The UAE has filed two complaints with the ICAO over what Qatar’s rivals say are airspace violations that threaten civil aviation.
The UAE accuses Qatar of sending fighter jets to intercept passenger flights and a civilian helicopter in Bahraini airspace.
Doha has denied approaching any UAE-operated flights.
The Saudi-led bloc cut off relations with Qatar on June 5, 2017, accusing it of supporting terrorism and Iran, which Doha denies.
Qatar has also filed a case at the ICJ accusing the UAE of human rights violations.
Judges at the court in The Hague - which rules in disputes between countries - will start a three-day hearing at Doha’s request on Wednesday.
The row has left the small peninsula nation regionally isolated with its only land border closed, its state-owned airline barred from using its neighbours’ airspace.