A genuine organisation with nothing to hide would say that they are sorry, but their activities are suspended until after the investigation and that they are complying fully with the investigation team.
Exactly and frankly I'm surprised they are allowed to keep operating during the investigation which could take up to 9 months to complete and a further 3 months to publish.
If the trustees had any sense they would be clamping down on everything now because given everything they are facing already, continuing on with activities when there are grave questions about the charities ability to safeguard, after you've been notified about an enquiry is beyond reckless.