Thirty-seven female political prisoners in Tehran's notorious Evin Prison have been denied visitation rights.

According to information obtained by Iran International, it came in response to their participation in an overnight sit-in on July 24 to protest the death sentence of fellow inmate Pakhshan Azizi.

Among the protesters were Nobel Peace Laureate Narges Mohammadi and Iranian writer and human rights advocate Golrokh Iraee.

The prisoners further protested Azizi’s death sentence through a one-day hunger strike on July 30, part of the ongoing “No to Execution” campaign held every Tuesday.

Azizi, sentenced to death for "armed rebellion," is one of at least four women at risk of execution on similar charges.

Azizi was the second woman in July this year to be sentenced to death on charges of "armed rebellion."

Already this year, rights groups claim Iran has carried out 300 executions. Last year, over 850 were reported as an execution wave sweeps the country in a bid to quash dissent.