Islamic State supporters in New Zealand are being monitored, a police spokeswoman says.
Since the Paris atrocities early last Saturday, several local Muslims have changed their Facebook cover photos to the Isis flag.
At least one has voiced his support for the attacks and Isis ideology.
The Herald has chosen not to identify the names of the pages.
"Police and other agencies are aware of and have an interest in the activities of people who might hold or express views that could be of security concern, and will take appropriate action where required," a police spokeswoman said.