Qatar denies holding any Iranian pilots. Doha said ​on Saturday that its search and rescue teams had ​found the remains of one pilot after Iranian aircraft ⁠violated Qatari airspace in March and failed to respond to ​attempts to contact them.

Qatar said it had contacted Iran to coordinate ​the handover of the remains and had invited Tehran to review details of its search and rescue operations, but had received no response.

Mohammad Baqerzadeh, ​commander of the Committee for the Search for Missing Persons ​of Iran's Armed Forces General Staff, said an Iranian Air Force expert ‌and ⁠fact-finding team had been waiting for months to enter Qatar, according to the semi-official Tasnim news agency.

Baqerzadeh accused Qatari officials of repeatedly delaying the investigation and preventing the pilots' return to ​Iran. He called ​for the International ⁠Committee of the Red Cross to urgently follow up on the case.

Baqerzadeh also said Kuwait ​was similarly withholding information about the fate of ​four Iranians ⁠held in Kuwait.

In May, Iran said the four were affiliated with the Revolutionary Guards and had been on a maritime patrol before ⁠entering Kuwaiti ​territorial waters because of a navigation ​disruption. Kuwait has said the four were suspected of planning hostile actions against ​the country.