Three people have been arrested in Dargaville as part of Operation Colbalt.
Photo: RNZ / Richard Tindiller
Police executed search warrants across four properties on 5 July.
Cannabis, methamphetamine and illegal ammunition were seized at the properties.
A 41-year-old man and a 24-year-old woman were arrested on methamphetamine-related charges.
A 39-year-old man was arrested and charged with unlawful possession of ammunition.
They are due to appear in Whangārei District Court on 6 July.
Whangārei CIB detective inspector Bridget Doell said police had zero tolerance for any violence, gang and drug activities.
"Police are working hard to ensure we keep our communities safe, and we will continue to actively target those involved in criminal activity."