Detective Inspector Warren Olsson said the nature and volume of the threats met the threshold for investigation and prosecution.
“Threats of violence are unacceptable and will be thoroughly investigated,” he said.
“The safety of all New Zealanders, including our elected representatives, is paramount, and nobody should be made to fear for their own safety.”
“We want to reassure the public that police take these matters seriously and will continue to hold offenders to account.”
Olsson said further arrests were likely.