Police would not comment on the specific incident, but a spokesperson said any interference with a police radio was deemed a risk to public safety.
"Anyone caught doing so may be prosecuted under sections 113 and 114 of the Radiocommunications Act 1989 for transmitting radio waves without a licence."
It's not the first time such a warning has been issued.
In 2017 Upper Hutt man Andrew Holt, an avid listener of police scanners, reported hearing pig oink sounds as well as someone singing "Old MacDonald Had a Farm" and lyrics from other rap songs.
NZ Herald reported at the time the person responsible could face up to a year in prison for criminal nuisance.