The publisher of Britain’s Sunday Mirror tabloid says it is being investigated by police over alleged phone hacking by its journalists.

Trinity Mirror PLC says police informed its newspaper subsidiary, MGN Ltd., “that they are at a very early stage in investigating whether MGN is criminally liable for the alleged unlawful conduct by previous employees in relation to phone hacking on the Sunday Mirror.”

The company said it did not accept liability.

Police would not comment Thursday.

Police have been investigating wrongdoing by newspapers since the 2011 revelation that Rupert Murdoch’s now-defunct News of the World hacked into the cell phone voicemails of celebrities and other public figures.

The probe has recently spread beyond Murdoch’s papers.

Trinity Mirror shares fell 3.7 percent on the London Stock Exchange after the announcement.

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