London (CNN) -- The mother of a British girl whose murder spurred legislation to protect children says her phone was targeted by a private investigator working for the now-defunct tabloid that led the campaign for the new law. Sara Payne, whose slain daughter was the namesake of Sarah's Law, said Thursday that police have confirmed unspecified "details" on a list kept by private eye Glenn Mulcaire, one of the central figures in the scandal that took down the 168-year-old News of the World earlier this month. "Sara is absolutely devastated by this news, we're all deeply disappointed and are just working to get her through it," a statement from her literary agency said Thursday. "Sara will continue to work with the proper authorities regarding this matter. There will be a further statement in due course, but at this point in time, she (or we) can make no further comment."
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NEW: News International says it is "deeply concerned" by the report
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Anti-pedophile activist Sara Payne says her phone was targeted
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Payne had defended News of the World in its last edition
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Ex-tabloid editor Brooks calls the action "abhorrent"
Sarah's Law
@placeholder, which went into effect in 2008, allows parents to look up the records of convicted pedophiles.
Glenn Mulcaire
In Thursday's statement, Payne's representatives said police had informed her during an earlier probe of the allegations that @placeholder did not have her information -- but a subsequent review found that he did.
Sara Payne
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Sara Payne
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"It is imperative for @placeholder and the other victims of crime that these allegations are investigated and those culpable brought to justice."