Austrian officials have voiced their relief after two of the country's citizens were released by Iran after years of imprisonment in the country, APA reports citing BBC.

Dual Austrian-Iranian nationals Kamran Ghaderi and Massud Mossaheb were freed as part of a prisoner swap involving Europeans and an Iranian diplomat.

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The pair's detention in Iran, on spying and security charges respectively, attracted criticism internationally.

Belgium said a third person - a Danish citizen - had also been released.

The trio were flying into Belgium via Oman following medical examinations, Belgian Prime Minister Alexander De Croo said.

Source: Azeri-Press News Agency