The publisher of British tabloid the Daily Mirror has acknowledged and apologized for unlawfully gathering information about Prince Harry in its reporting, and said it warrants compensation, at the outset of the prince’s first phone hacking trial Wednesday.

The admission was made in court filings outlining Mirror Group Newspapers’ defense.

The group continued to deny that it hacked phones to intercept voicemail messages, and said that Harry and three less-well-known celebrities brought their claims beyond a time limit.

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But it acknowledged there was “some evidence of the instruction of third parties to engage in other types of UIG (unlawful information gathering) in respect of each of the claimants,” which includes the Duke of Sussex. It said this “warrants compensation” but didn’t spell out what form that might take.

Read more: AP