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."
@highlight
NEW: News International says it is "deeply concerned" by the report
@highlight
Anti-pedophile activist Sara Payne says her phone was targeted
@highlight
Payne had defended News of the World in its last edition
@highlight
Ex-tabloid editor Brooks calls the action "abhorrent"
@placeholder, which went into effect in 2008, allows parents to look up the records of convicted pedophiles.