BEIRUT (AP) — Iran’s imprisoned Nobel Peace Prize laureate Narges Mohammadi may have suffered a heart attack, one of her lawyers said Tuesday.

Two of Mohammadi’s lawyers and her sister visited her in Zanjan Prison in northwestern Iran on Sunday, her French lawyer, Chirinne Ardakani, told The Associated Press after being briefed by the two Iranian lawyers who went to the prison.

“When my colleagues saw her, they were shocked because she was very pale and had lost a lot of weight, and she was not alone but aided by a nurse,” Ardakani said.

She added that, according to Mohammadi, her fellow inmates told her that on March 24 she was unconscious for over an hour. Upon later examination at the prison’s clinic, a doctor told her that she probably had had a heart attack.

“She said she has since been having chest pain more than once a day and she has breathing difficulties and that she is in a very bad state,” Ardakani said.