Police say they have uncovered six drug labs and arrested 11 people in Auckland and Northland following a series of raids.
About 200 officers were involved in Operation Slab which targeted methamphetamine and ecstasy manufacturers in six police districts.
Drugs, firearms, ammunition and several vehicles were seized in the raids which took place on Tuesday under the Proceeds of Crime Act.
Police say a number of young children were also found at the properties.
Investigations are continuing in Waikato, Coromandel and Wellington. Police say they expect to further labs and make more arrests.