( CNN ) -- Authorities in Tehran , Iran , have given the go-ahead to execute a woman who initially was sentenced to death by stoning , according to an activist working on her behalf . However , what method will be used to execute Sakineh Mohammadi Ashtiani is unclear , said Mina Ahadi , spokeswoman for the International Committee Against Stoning . The execution could happen as soon as Wednesday , she said , citing information received from a source in Tabriz , Iran , who is close to Ashtiani 's family . Ashtiani initially was sentenced to death by stoning for adultery . The Iranian government later said she was also convicted of murdering her husband , but her lawyer and family dispute that . A letter from Tehran was delivered to the prison in Tabriz where Ashtiani is being held three days ago , Ahadi said , giving the go-ahead for Ashtiani 's execution . Ashtiani , 43 and a mother of two , drew international attention when she was sentenced to death by stoning . She concedes that she was convicted of adultery , as initially reported , but says she was acquitted of murder . `` The man who actually killed my husband was identified and imprisoned , but he is not sentenced to death , '' she said in August . The Iranian government 's claims that she was convicted of murder are a lie , she told the Guardian newspaper through an intermediary . `` They are embarrassed by the international attention on my case , and they are desperately trying to distract attention and confuse the media so that they can kill me in secret . '' Ashtiani 's son and her attorney are still in jail after being arrested last month , Ahadi said . Also still detained are two German journalists . `` The International Committees against Stoning and Execution call on international bodies and the people of the world to come out in full force against the state-sponsored murder of Sakineh Mohammadi Ashtiani , '' as well as the release of the others , Ahadi said in a statement . Before his arrest , Ashtiani 's son , Sajjad Ghaderzadeh , said court officials stole documents and files pertaining to the murder of his father in order to `` promote his mother as a murderer . '' And Ahadi 's committee said the murder charges are `` fabricated '' by the Iranian regime . In August , Ashtiani appeared on state TV confessing that she knew about a plot to kill her husband but felt she had been misled . Amnesty International condemned the interview . Ghaderzadeh and attorney Hootan Kian will not be issued an attorney , because the government claims they do not need one , according to Ahadi . Ashtiani 's other former lawyer , Mohammad Mostafaei , is being protected by European diplomats after he fled to Turkey from Iran . Mostafaei claims that Iranian authorities tried to arrest him without cause .
Sakineh Mohammadi Ashtiani could be executed as soon as Wednesday . She was initially sentenced to death by stoning . The case has sparked outrage in Iran and the United States, with President Barack Obama calling for her immediate release.