Three people arrested over the seizure of $17 million worth of methamphetamine allegedly imported to New Zealand by the Bandidos motorcycle gang have pleaded guilty to a series of charges.

Queenie Anne Matthews, 59 and Meinata Piahana, 29, on Monday pleaded guilty to three charges each of importing or attempting to import packages of P into Auckland in late 2015 and early 2016.

Further, more serious charges they originally faced would be dropped, the High Court at Auckland was told.

Co-accused Adrian Le'Ca, 56, entered guilty pleas to importation in 2016, possessing 14.9kg of methamphetamine, and 1.9kg of cocaine. Five other charges against him have been dismissed.

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The trio will be sentenced on November 10.

At the time of the arrests in October, 2016, police said about 17kg of methamphetamine, $150,000 of jewellery and $200,000 cash had been seized in a seven-month operation with Customs.

They alleged the drugs had been imported by a member of the Thailand chapter of the international Bandidos gang.

A trial for the group - along with a fourth woman whose single money laundering charge is expected to be dropped - had been set to start on Monday.

- NZN