British-Iranian dual national Alireza Akbari, who was sentenced to death in Iran, has been executed.
Mr Akbari's family had been asked to go to his prison for a "final visit" on Wednesday and his wife said he had been moved to solitary confinement.
The ex-deputy Iranian defence minister was arrested in 2019 and convicted of spying for the UK, which he denied.
UK Prime Minister Rishi Sunak said the execution was a "callous and cowardly act, carried out by a barbaric regime".
Iran's rulers had "no respect for the human rights of their own people" Mr Sunak said, adding that his thoughts were "with Alireza's friends and family".
UK Foreign Secretary James Cleverly said the execution would "not stand unchallenged".
The Iranian judiciary's official news outlet Mizan reported on Saturday that Alireza Akbari had been hanged, without specifying the date when the execution took place.
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