Coulston said all member kindergartens - just over 100 - had been warned to keep their laptops and computers switched off, while they checked whether any data had been accessed.
Hundreds of organisations across the world have also been affected, including at least 11 schools in New Zealand.
IT specialists this morning warned the full extent of the damage was yet to be seen.
US cybersecurity teams have been working feverishly to stem the impact of the single biggest global ransomware attack on record, the AP reported today.
An affiliate of the notorious Russian REvil gang, best known for extorting $15.6 million (US$11m) from meat-processing multinational JBS after an attack on May 1 this year, infected thousands of victims in at least 17 countries on Saturday, cybersecurity researchers said. They reported ransom demands of up to US$5m.
- RNZ