Beleaguered News International chief executive Rebekah Brooks has denied all knowledge of the Milly Dowler hacking or any other case while she was editor of the News of the World..
In a letter to MPs she she insisted there was "no reason to believe" that hacking had been used by any other News International titles.
She was responding to a request for fresh evidence from Keith Vaz, the Labour MP who chairs by the cross-party home affairs select committee.
Lawyers representing Andy Coulson, another former NotW editor, said it would be inappropriate for him to answer the committee's questions because of the active criminal investigation.
In her letter published by the committee, Ms Brooks said: "I want to be absolutely clear that as editor of News of the World I had no knowledge whatsoever of phone hacking in the case of Milly Dowler and her family, or in any other cases during my tenure.
"I also want to reassure you that the practice of phone hacking is not continuing at the News of the World. Also, for the avoidance of doubt, I should add that we have no reason to believe that any phone hacking occurred at any other of our titles."
The strongly-worded correspondence was revealed hours after the Church of England became the latest body to enter the phone hacking storm, threatening to pull nearly £4 million in investments from News Corporation if the organisation fails to hold "senior managers" to account.
It also followed a report in The Guardian that millions of emails from an internal archive at News International may have been destroyed in what could be seen as a bid to obstruct Scotland Yard's inquiry. The allegation was denied by the publisher.
News Corp owner Rupert Murdoch has kept largely silent on the scandal, but he spoke briefly to reporters in Sun Valley, Idaho, where he was attending a media conference. When asked whose decision it was to close the paper he said, "It was a collective decision."
David Cameron has announced two probes into the phone hacking scandal. The first, to be led by a judge, will investigate the criminal allegations levelled at News of the World staff and whether other newspapers are implicated. The second, expected to begin this summer, will focus on the ethics and practices of the British press and will be conducted by a "credible panel of figures" drawn from a range of different backgrounds.