Mohammadi, 54, won the Nobel Peace Prize in 2023 while in prison for her campaign to advance women’s rights and abolish ​the death penalty in Iran.

She was sentenced to a new prison ​term, the foundation said in February this year, in the ⁠build-up to the US and Israeli war against Iran.

She suffered a suspected ​heart attack in late March and was transferred to the hospital a month later, ​first in the northwest city of Zanjan, then, after a temporary suspension of her sentence on heavy bail, to Tehran’s Pars Hospital, the foundation has said.

“Her recovery demands ​strict medical supervision outside prison walls. Returning her to detention is ​a death sentence,” the foundation quoted Mohammadi’s daughter, Kiana Rahmani, as saying.

The foreign ministry made ‌no ⁠immediate response to a request for comment, and there was no mention of the case on state media.

Mohammadi, whose detentions have attracted worldwide attention, was arrested in December after denouncing the death of a lawyer, Khosrow ​Alikordi. A prosecutor ​told reporters that ⁠she had made provocative remarks at Alikordi’s memorial ceremony.

The Nobel committee at the time called on Tehran to ​free her immediately.

“Narges Mohammadi was initially hospitalised in the ​CCU of ⁠Mousavi Hospital in Zanjan from May 1st to May 10th,” the foundation said.

“After 150 days since her brutal arrest in Mashhad… following a temporary suspension ⁠of her ​sentence, she was transferred by an ambulance ​to the CCU of Pars Hospital in Tehran from May 10th to May 17th,” the ​foundation added.