Arrests across the country, over a large Christchurch cocaine bust - worth nine million dollars

Customs seized more than 25 kilograms of the Class A drug at Lyttelton Port in March.

It's prompted searches throughout New Zealand over the past six weeks, in Christchurch, Wellington, Tauranga and Auckland.

Police have arrested four men aged 30 to 36.

Detective Senior Sergeant Phil Sparks says this seizure equates to more than 250-thousand doses of cocaine.