A number of schools in Auckland have been evacuated after at least 10 were sent bomb threats by email.
Police said they did not believe there was a danger, but were inquiring into the source.
"Police have visited each school to provide reassurance ... These sorts of threats are taken seriously"
Green Bay High School was among those that were evacuated. The school has since been given the all clear.
"We worked with the New Zealand Police who came to out to school and have advised us that it is safe for everyone to return to class," Prinicpal Fiona Barker said.