By RNZ
Documents from Waikato District Health Board appear to have been released onto the dark web after the ransomware attack that crippled five hospitals' IT systems in May.
RNZ has been shown screenshots of what appears to be a link to a directory of sensitive information.
The list of documents suggests it includes data of patients and staff.
It has been six weeks since a ransomware attack crippled its systems and forced a massive overhaul of its operations.