CE are investigating whether Trinity Mirror is criminally liable for the alleged phone hacking by former Sunday Mirror journalists.
Trinity said yesterday that the investigation by the London Met police into the journalists had been widened to include the publisher.
“The group does not accept wrongdoing within its business and takes these allegations seriously,” Trinity Mirror said in a statement.
In the first hacking scandal arrests against a title not owned by Rupert Murdoch, police arrested four former journalists from the Sunday Mirror in March as part of a probe into alleged attempts between 2003 and 2004 to hack into voicemails.
Shares in Trinity Mirror closed down 2.3 per cent at 125.2p yesterday after news of the investigation broke.