Teenage Iranian twin sisters were brutally tortured for four months for protesting against the regime, with one sentenced to death after she was forced to confess to save her sister from being raped, their family revealed.

Taraneh and Romina Rahimi — who were just 19 and still in high school when they joined millions in the January anti-regime protest — suffered beatings, broken feet, had their hair ripped out while in Iranian custody, The Guardian reported.

(From left) Taraneh and Romina Rahimi were seized after joining protests against the Iranian regime.

The twin sisters were just 19 and still in high school when they joined millions in the January anti-regime protest in Tehran. Getty Images

The twins were unrecognizable by their mother, Marzieh Nourmohammadi, during their sentencing, where she learned that Taraneh would be put to death after confessing to taking part in the demonstrations.

Nourmohammadi claims her daughter only confessed after prison guards threatened to rape Romina in front of her if she did not comply.