Hello, welcome to the website. My name isXXXXX can assist you with this.
If there was a legitimate use for the money coming out, then the fraud squad and/or the bank would not be interested any further. As such you would just need to telephone them tomorrow (Monday) and inform them both accordingly. Alternatively, just put it in writing to them both and that should be the end of the matter.
Yes, and you may need to do the same with the police, but they should then drop the issue altogether. If you took the funds or gave somebody permission to, then there is no criminal offence to investigate.
That's okay - it happens sometimes!
Is there anything else you would like to ask me?