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The News of the World (NoW) has been illicitly hacking into the voicemail messages of prominent people to find stories.
It admitted intercepting voicemails in April after years of rumour that the practice was widespread, and amid intense pressure from those who believed they had been victims.
The paper ceased publication on 10 July 2011 after fresh allegations. The final edition signed off with headline "Thank you and goodbye" and included an apology.
Police have a list of 4,000 possible targets. Among them are celebrities, sport stars, politicians and victims of crime.
They include actor Hugh Grant, publicist Max Clifford, comedian Steve Coogan, actress Sienna Miller, Lord Prescott, London Mayor Boris Johnson, football pundit Andy Gray and ex-footballer Paul Gascoigne.
Murdered teenager Milly Dowler and the parents of murdered Soham schoolgirls Holly Wells and Jessica Chapman were allegedly targeted.
Sara Payne, whose Sarah's Law campaign for better child protection regulations was championed by the NoW after her eight-year-old daughter was murdered in 2000, has been told her details may have been held by Glenn Mulcaire.
Questions have been raised about the conduct of journalists at the Trinity Mirror group of newspapers.
The group, which publishes titles including the Daily and Sunday Mirror, Daily Record and People, says all its journalists work within the law.
However, a journalist who worked at the Sunday Mirror in the last decade has told the BBC they witnessed routine phone hacking in the paper's newsroom.
Model Heather Mills has alleged that a senior Mirror Group journalist admitted hacking her voicemails after quoting passages verbatim.