Justice Minister Michael Keenan has revealed a new way that ice manufacturers have used to import the illegal drug into Australia.

720 litres of liquid methylamphetamine has been seized in a Joint Organised Crime  Group (JOCG) operation in New South Wales.

Four men have been arrested for their alleged involvement in the importation and manufacture of the methylamphetamine, with an estimated potential street value of more than a billion dollars.

The Justice Minister spoke to Gary Adshead on the 6PR Morning Show.