Four people have been arrested in Wellington after 20 litres of the drug GBL, worth $120,000, was intercepted by Customs.
Customs officials last month discovered the package from China, which was destined for an address in Lower Hutt.
Wellington police and Customs allowed the package through the border and a joint investigation was launched.
Two men, aged 40 and 50, and two women, aged 35 and 39, were arrested and charged with drug-related offences.
They appeared in court yesterday and today, charged with a number of drug offences including importing a Class B drug, possession and supplying drugs.