Police have confirmed phone calls threatening a number of schools on Thursday came from overseas.
While they did not say exactly where the calls came from, police say they have been working with international partners to follow the phone call trail.
Several schools have responded to the threats by evacuating students, including Tahatai Coast School in Papamoa, Logan Park High School in Dunedin and Berkley Normal Middle School in Hamilton.
"We understand the fear and concern that these types of events will cause, however we reiterate that we have not established any actual threat to the schools who received calls yesterday," police said in a statement.
Police say they are continuing to work with the schools involved and the Ministry of Education in response.