Fears are growing for more Iranian athletes facing execution after mountain climber Ali-Sina Mostafavi became the latest in a string to be killed by the regime.

Mostafavi – who documented his ascents of some of the world’s highest peaks, including Mount Everest – was executed on 14 October having been arrested in April after the anti-government protests a few months earlier. His death followed the killing of Siavash Jamshidi Kheirabadi, a taekwondo athlete, at the start of October, and the mixed martial arts fighter Gholamreza Khani Shakarab, who was hanged in May.

Now Human Rights for Sport – a group of former Iranian athletes based in Oslo that has been documenting the growing number of cases – has warned that at least six more are facing execution after having their sentences upheld by Iran’s supreme court.…