Two men have been hanged in Iran for killing a member of the security forces during nationwide protests against the government last year.
Mohammad Mahdi Karami and Seyed Mohammad Hosseini had appealed against their sentences, saying they had been tortured into making false confessions.
UK Foreign Secretary James Cleverly said the executions were "abhorrent".
The total number of protesters known to have been executed in the aftermath of the unrest is now four.
Demonstrations against the clerical establishment erupted in September following the death in custody of a woman detained by morality police for allegedly wearing her hijab, or headscarf, "improperly".
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