British Foreign Secretary James Cleverly said late on Friday Iran must not follow through with the execution - a call echoed by the U.S. State Department.
Mizan said in a Tweet early on Saturday the sentence had been carried out, without saying when.
In an audio recording purportedly from Akbari and broadcast by BBC Persian on Wednesday, he said he had confessed to crimes he had not committed after extensive torture. Britain has also been critical of the Islamic Republic's violent crackdown on anti-government protests, sparked by the death in custody of a young Iranian-Kurdish woman in September.
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