Two years of investigating a major crime smuggling ring has ended with 12 arrests, and more than 200 kilograms of drugs seized

Police conducted 17 search warrants across Auckland in recent days, seizing 4-million dollars in assets and 500-thousand dollars in cash.

More than 183 kilos and 39 litres of meth are off the streets, along with more than 50 kilograms of pseudoephedrine and MDMA.

Nine men and three woman, ranging from their 30s to mid 50s, have appeared in court on an array of drug-related charges.

Police say most of the ring's deliveries were bound for addresses in Flat Bush.