One Dane and two Austrian-Iranian citizens released from detention by Tehran arrived in their home countries on Saturday, after the latest in a series of prisoner swaps.
The three Europeans had landed shortly before 2:45 am (0045 GMT) Saturday at Melsbroek military airport just outside Brussels.
They had flown there from Muscat, the capital of Oman which helped broker their release.
Belgian Foreign Minister Hadja Lahbib welcomed them at the airport along with Danish and Austrian diplomats.
Vienna reacted with relief at the release of its two citizens, named as Kamran Ghaderi and Massud Mossaheb, who it said had been arrested "unjustly" by Iran in January 2016 and January 2019, respectively.
Thanking Belgium, Austrian Foreign Minister Alexander Schallenberg said: "Our years of diplomatic efforts to secure their release have borne fruit... Today is a very emotional day for all of us."
Ghaderi and Mossaheb arrived at Vienna airport from Belgium at around 11:30 am (0930 GMT) on Saturday, where they were welcomed by their families and Schallenberg, his spokeswoman Claudia Tuertscher told AFP.
The Danish man, identified as Thomas Kjems, landed at Copenhagen airport at around 11:00 am local time, telling reporters that he had been treated well in Iran, without being subjected to torture.
Kjems had been arrested in Iran in November 2022 on the sidelines of a demonstration for women's rights, according to Belgian Prime Minister Alexander De Croo.
- 'Operation Blackstone' -
Melsbroek is the same airport that Belgian aid worker Olivier Vandecasteele arrived at on May 26 upon being freed by Iran after 15 months in captivity.
His liberation was obtained in exchange for Belgium freeing Iranian diplomat Assadollah Assadi, who had been imprisoned for a 2018 plot to bomb an Iranian opposition rally outside Paris.
Iran had levelled charges of "espionage" at Vandecasteele but his family, the Belgian government and rights groups all say that was a fabricated case used to pressure Brussels for Assadi's release.
Belgian government officials said the release of Vandecasteele, the Dane and the two Austrian-Iranians were all part of "Operation Blackstone", in reference to an 18th-century English jurist William Blackstone, who was known for declaring: "It is better that 10 guilty escape than one innocent suffer."
The exiled Iranian opposition group the National Council of Resistance in Iran, the target of the 2018 bomb plot, has criticised Assadi's release, saying it violated a Belgian court order requiring them to be consulted first.
Critics of the prisoner swap said it would encourage Tehran to take more Europeans hostage as bargaining chips to seek the return of agents like Assadi arrested for terror offences in the West.
De Croo stressed his government "continues to fight for the respect of human rights and the release of European citizens unjustly detained by Iran".
- Dozens still held -
The exact number of foreign passport holders still being held by Iran is thought to be in the dozens but is not precisely known, as the families of some detainees opt to negotiate out of the public eye.
Belgian government officials said at least 22 "innocent" Europeans remained detained in Iran. France last week gave a figure of more than 30 EU citizens held.
Austria's Schallenberg said of his two freed compatriots: "We are especially happy for the brave families who have suffered so much in recent years. Now they can finally embrace their husbands, fathers and grandfather again in freedom."
The Gulf sultanate of Oman has emerged as a key interlocutor between the West and Iran.
In 2016 it also played a mediator role in the release of Washington Post journalist Jason Rezaian and three other US citizens who had been held by Tehran.
In May, Iran released a Frenchman and a French-Irish citizen, both of whom had gone on hunger strike to protest their detention and conditions.
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© Agence France-Presse
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