Two more people have been arrested following an alleged $1million P bust at the Picton ferry this morning.

A 22-year-old man was arrested after his vehicle was stopped by armed police coming off the Cook Strait ferry shortly after midnight allegedly carrying around 1kg of methamphetamine.

It led to police raiding a suspected gang house in the Christchurch suburb of Papanui later in the morning.

Now, police have said that a house in the Auckland suburb of Greenlane was also raided in what has been described as a "coordinated police operation to interrupt the supply of illegal drugs in New Zealand".

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"A search of the property resulted in a large quantity of cash being seized along with smaller amounts of methamphetamine," said Detective Inspector Stu Graham of Organised and Financial Crime Agency New Zealand (OFCANZ).

Two people at the property were arrested.

A 29-year-old man is due to appear at Auckland District Court this afternoon charged in relation to the supply of methamphetamine, possession of methamphetamine and unlawful possession of a restricted weapon.

A 34-year-old female has been summonsed to appear at Auckland District Court on Monday charged with possession of methamphetamine.

A 22-year-old man is due to appear at Blenheim District Court today charged with possession for supply of methamphetamine.

Police investigations are continuing.Armed police remain at the scene of the suspected Christchurch gang pad.

"New Zealand Police are committed to interrupting the supply of illegal drugs in New Zealand and preventing the social harm this illegal activity supports," Mr Graham said.