The United Arab Emirates accused rival Qatar of "intercepting" a passenger plane en route to Bahrain on Monday, as Doha denied the accusation in a row over alleged airspace violations.

"The General Civil Aviation Authority received a message from a national carrier on Monday morning that an aircraft on a routine flight to Manama was intercepted by Qatari fighter jets in a flagrant and serious threat to the safety of civil aviation and a clear violation of international law," it said in a statement carried by the UAE state news agency. 

"This is a routine flight that has all the required paperwork," it said.

A spokeswoman for Qatar's foreign ministry denied the accusations.

"The state of Qatar announces that the claims of Qatari fighter planes intercepting a UAE civil aircraft (are) completely false," Lulwa al-Khater said on Twitter.

Four UAE-based airlines – Emirates, Etihad, flydubai and Air Arabia – operate flights to Bahrain. 

Spokespersons for the airlines could not immediately confirm or deny the news. 

Monday's accusation comes after Qatar accused UAE fighter jets of violating its airspace in December and January. 

Qatar is located in the Gulf, between Bahrain and the United Arab Emirates and across from Iran.

Tensions have escalated in the Gulf since Saudi Arabia, the United Arab Emirates, Bahrain and Egypt cut all ties with Qatar in June, accusing Doha of supporting Islamist extremists and being too close to Saudi Arabia's arch-rival, Iran.

They have banned all flights to and from Doha and cut off most trade links.

Qatar denies the allegations, arguing the bloc aims to incite regime change in Doha.

Top photo: Saudi King Salman (left) walks with Qatari Sheikh Abdullah bin Ali Al Thani at the monarch's vacation home in Tangiers, Morocco, Aug. 17, 2017. Exiled Sheikh Abdullah, once promoted by Saudi Arabia amid its ongoing dispute with Doha, appeared in an online video posted Sunday, Jan. 14, 2018, and aired by Doha-based satellite news network Al-Jazeera, claiming he's being held against his will in the United Arab Emirates, an allegation denied by an Abu Dhabi official. [File photo: AP]