Customs seized more than $2m of methamphetamine at Auckland Airport over the weekend.
Two people were arrested and charged after the seizure of 13.5kg of meth worth about $2.4m, which was concealed within heavy steel machinery.
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A 22-year-old Waikato man and a 48-year-old Auckland woman both appeared in court charged with importation of a Class A controlled drug.
Police are looking for three other people in relation to the crime.
Detective Inspector Paul Newman says it's a relief to have prevented the drugs from reaching New Zealanders.
"It is clear that those involved were attempting to test the system to see if this method would get past authorities," he said in a statement.
"It didn't work."
He says Police believe that if the drugs had successfully made it past the border, the culprits would likely have tried to import even more into the country.
"We say this time and time again, but meth is causing significant harm across our communities."
Anyone with information regarding the crime is urged to contact Police.