Scotland Yard detectives, who seized notebooks from Mulcaire when he was arrested in 2006, have discovered phone numbers belonging to Charlotte Church’s Los Angeles agent and her New York publicist, Bloomberg reported.
Allegations of News of the World hacking in the US have surfaced previously. The FBI is looking into allegations that the actor Jude Law’s phone was hacked while he was on US soil.
And last year there were allegations that the now defunct Sunday tabloid hacked the telephone’s of 9/11 victims.
Suggestions that victims in the USA were targeted will be further embarrassment for Rupert Murdoch. The phone hacking scandal has so far been largely confined to the UK.
If it spreads to the US it would be extremely damaging to Rupert Murdoch given that his News Corporation media empire is based there.
Miss Church’s New York-based publicist, Kevin Chiaramonte said he expected to be contacted by Scotland Yard and added: “I’m going to work with the authorities to the fullest extent I can and if there’s anything I can do to help the case I will.”
The news came as the first edition of Mr Muroch’s new Sunday newspaper venture hit the shops. The Sun on Sunday replaces the void left by the News of the World, which closed in July amid a series of hacking revelations.
However the title was subject to a campaign on Twitter with users urging one another not to buy the paper. The hashtag #neverbuythesun was briefly trending on the website.
Meanwhile, the relationship between journalists and the police is set to be examined as the Leveson Inquiry into media ethics begins its second stage on Monday.
Allegations that journalists at News International paid police officers are likely to be addressed.
Sue Akers, the officer in leading Operation Weeting, the investigation into phone hacking at the News of the World, will give evidence today. As will Brian Paddick, the former police officer turned politician, and Lord Prescott, the former Labour party deputy leader.
Other former Scotland Yard officers including Peter Clarke and Andy Hayman, who worked on the original investigation, and John Yates, who twice declined to re-open the case, will also give evidence on Thursday, as will Sir Paul Stephenson, the former commissioner.
News International declined to comment.
