The trio were flying into Belgium, the Belgian prime minister said.

Austrian Foreign Minister Alexander Schallenberg tweeted his relief that both men could come home after years of “arduous imprisonment”.

Chancellor Karl Nehammer said their long path of suffering was now at an end.

Mr Ghaderi was arrested in Iran in 2016, and sentenced to ten years in jail on spying charges – after what his family says was a forced confession.

Mr Mossaheb – who is understood to be in his 70s – was arrested in in Teheran in 2019, and sentenced for what Amnesty International has called “vague national security offences”.

The pair spent 2,709 and 1,586 days in confinement respectively.

Denmark has not named its national.

The earlier prisoner swap between Belgium and Iran involved Belgian aid worker Olivier Vandecasteele and Iranian diplomat Assadollah Assadi.

Mr Vandecasteele was freed after 455 days in prison, the Belgian prime minister said.

He had been sentenced to 40 years in prison and 74 lashes in January, after being convicted of espionage and several other charges. He denied any wrongdoing.

Mr Assadi was convicted on terrorism charges in Belgium in 2021 in relation to a failed bomb plot in France, and had been jailed for 20 years.

Iran’s foreign minister said Mr Assadi had been “illegally detained”.

Friday’s announcement of the release of the Austrian-Iranian citizens came after mediation talks involving Oman. The Gulf nation also brokered the earlier prisoner exchange.

In his social media post, Mr Schallenberg called the day “very emotional” after years of discreet diplomatic efforts.

He paid tribute to the Austrian embassy in Tehran as well as his Belgian and Omani counterparts.

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