A private detective employed by News International to put hundreds of people under surveillance has said he was commissioned by as many as 30 journalists working on the News of the World, the British Sunday paper closed this year because of the scandal about phones being hacked.
Derek Webb, who was paid to follow a string of people - including Princes William and Harry, Angelina Jolie and Tom Watson, the MP spearheading Parliament's investigations into phone hacking - has said he will act as a witness if any of them opt to take legal action against NI.
While surveillance is not illegal, Webb's pledge suggests that NI could find itself facing legal action from people who claim their privacy has been invaded - in addition to the scores of claims brought against it by victims of phone hacking.
Webb's claims, which suggest there was a culture of surveillance that permeated the NOTW newsroom, are contained in a dossier detailing the work the former undercover police officer did for NI from 2003.
The dossier, containing the names of around 150 celebrities and scores of non-famous targets, will be submitted to the Leveson inquiry investigating journalistic practices. They will also include details of one surveillance operation that Webb undertook on behalf of the Sun, a daily paper also owned by NI. Webb said he had decided to go public with his claims after it emerged that video footage he took of two solicitors acting for people whose phones had been hacked by the NOTW was leaked to the media.