These allegations have only ever been heard in relation to the extradition hearings and have not been put to the men in a trial.

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The mood could change if Britain allows extradition hearings to proceed.

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They have denied the charges while they await extradition hearings.

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However, New Zealand District Court's Judge David Harvey said local laws required extradition hearings to be "properly informed" adding that the case would be "one-sided" and merely an "administrative" affair were the material not to be shared.

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