TEHRAN, Sept. 5 (UPI) -- An Iranian woman sentenced to die for adultery faces a sentence of 99 lashes because of a case of mistaken identity, a human rights group says.

The International Committee Against Stoning said Iranian authorities imposed the lashing of Sakineh Mohammadi Ashtiani, sentenced to death by stoning for adultery, after seeing a photo of a woman without a head scarf in The Times of London, CNN reported Sunday.

The Times apologized for misidentifying the woman, saying the woman in photo was really Susan Hejat, a political activist living in Sweden. The London newspaper said one of Ashtiani's former lawyers, Mohammed Mostafaei, gave the paper the photo.

Mostafaei told CNN he still thinks the photo may be of his former client. The Times said Mostafaei told editors Ashtiani's son e-mailed him two photographs several months ago, saying both were of his mother.

"One was the widely used picture of Ms. Ashtiani with her face obscured by a chador (cloak), and the other was the one used by The Times," the newspaper said in a statement Friday. "That showed the full face of a woman."

The Committee Against Stoning said Mostafaei was responsible for providing "an explanation as to why he has disseminated (a) counterfeit photo and information regarding Sakineh's case; his action has only led to increased pressure on Sakineh and her family."

The committee also condemned the "barbaric new sentence of 99 lashes" on Ashtiani, demanding it be revoked immediately."