Trinity Mirror, the parent company of the Daily Mirror and The People is down following news that both tabloid newspapers have been drawn into the wave of phone-hacking scandals.
Former England football manager Sven Goran Erikson is among four people intending to sue the Daily Mirror and the Sunday People.
Until now, firm allegations of phone hacking have only related to titles owned by Rupert Murdoch's rival News Corporation: The News of the World and, to a lesser extent, The Sun.
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When contacted, a Trinity Mirror spokesman said: "We have no comment, we are unaware action has been taken at the High Court."
