Hospitals in the Waikato are currently experiencing a full outage of their information services with landlines also down because of a major cyber attack.
Clinical services across Waikato DHB have been seriously affected by the attack and the health board says they have engaged external assistance to address the incident.
The outage is affecting all clinical services across Waikato DHB hospitals (Waikato, Thames, Tokoroa, Te Kuiti and Taumarunui) to varying degrees.
The DHB stated they may have to cancel some outpatient clinics because of the attack but wanted to assure the public that all inpatients will continue to receive quality care from staff.
The health board said government authorities have been advised of the situation and the DHB is working hard to get services back online.
"The care of our patients remains our top priority, and we are managing our services to ensure they are kept safe and receive the appropriate care."
The DHB is uncertain how long it will be until the situation is resolved.
The health board stated people who are affected by the cancelled outpatient clinics will be contacted to rebook their appointments.
People are urged to still contact 111 if they have an emergency or if they are unwell to still contact their local GP or urgent care centre.
The DHB asks people to consider using their mobile phones to contact loved ones in hospital as the landline services are down.