About 200 people were asked to leave Rotorua Library on Wednesday after a possible firearm sighting.
A police spokesman said police responded to a report of the possible sighting shortly after 3.30pm on Wednesday at Rotorua library. Police were armed as a precaution.
Library staff and patrons were asked to leave the building while police conducted a search.
Inquiries are ongoing to find the offenders.
Rotorua Lakes Council deputy chief executive of community wellbeing Anaru Pewhairangi said library staff and patrons were directed by police to leave the building after the possible sighting.