The Iranian embassy in London said in a statement reported by The Times that Sakineh Mohammadi-Ashtiani would no longer be stoned to death, a practice condemned by Western governments as "medieval" and tantamount to torture.
The embassy said that "according to information from the relevant judicial authorities in Iran, (Mohammadi-Ashtiani) will not be executed by stoning."
Her lawyer in Iran, however, said he had yet to receive any confirmation of the news, and bemoaned the vagueness of the statement which did not say whether she might be killed by other means.
"I have yet to be told of any stay in implementation of the sentence," Mohammad Mostafavi told AFP by telephone. "My client remains in prison."
The embassy did not elaborate on whether her conviction had been quashed or the sentence had been commuted to an alternative form of capital punishment -- in Iran normally hanging from a crane inside prison walls.
"It didn't say the verdict had been overturned, so is she going to face some alternative punishment, is she going to be released or will there be a retrial?" Mostafavi said.
Mohammadi-Ashtiani, 43, was convicted in 2006 or 2007 and has already received 99 lashes, human rights watchdog Amnesty International said. Amnesty International UK warned on July 1 that her execution may be "imminent".
Open letter of condemnation
In the past week, the European Union, Britain, France and the United States have urged the Iranian authorities to stay the execution.
An open letter condemning the execution has also been signed by figures such as former US secretary of state Condoleezza Rice, three ex-British foreign ministers, Nobel laureate Jose Ramos-Horta and actor Robert De Niro.
Drewery Dyke, researcher on the Middle East at Amnesty International, told AFP the Iranian embassy's statement "raises more questions than it answers".
"It remains to be seen if the judicial authorities in Iran will back the statement of the embassy and order a review of this case," he said. "We remain concerned about what is going to happen to this woman and her family."
On Thursday, British Foreign Secretary William Hague condemned the use of stoning in Iran, saying that if this "medieval" execution went ahead it would "disgust and appal" the rest of the world.
"I think that stoning is a medieval punishment that has no place in the modern world and the continued use of such a punishment in Iran demonstrates in our view a blatant disregard for human rights," he said.
In Washington the same day, US State Department spokesman Mark Toner told reporters: "Stoning as a means of execution is tantamount to torture. It's barbaric and an abhorrent act."
"We condemn in the strongest terms the use of the practice of stoning anywhere it occurs as a form of legalized death by torture," he said.
French Foreign Minister Bernard Kouchner added his voice on Friday, saying: "Everything about the case of Mrs. Sakineh Mohammadi-Ashtiani offends the universal conscience."
European Union foreign affairs chief Catherine Ashton has also urged Iran to stop the execution of Mohammadi-Ashtiani, saying death by stoning was "a particularly cruel method of execution which amounts to torture."
A host of prominent names from the worlds of politics and arts, including actor Robert Redford and philosopher Bernard Henri Levy, signed an open letter Friday in The Times.
"On top of what she has already endured, Ms. Ashtiani faces a gruesome and agonizing death," said the letter. "We urge the Iranian government to overturn this unjust sentence and reconsider Ms. Ashtiani's case."
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