Story highlights Four charged over the importation and manufacture of 720 liters of methylamphetamine

Drug was seized from a shipment bra inserts and art supplies

(CNN) Australian police have seized $1 billion Australian dollars' worth of the drug "ice" from a shipment of silicon bra inserts and art supplies, the country's federal police said, worth approximately US$700 million.

According to authorities, the bust is one of the biggest in Australia's history, and the largest seizure of liquid methylamphetamine ever.

"This has resulted in 3.6 million individual hits of ice being taken off our streets," said Federal Justice Minister Michael Keenan.

Four people have been charged over the haul, which included 720 liters of the drug, the Australian Federal Police said Monday.

Photos: Australian customs discovered around 190 liters of liquid methylamphetamine hidden inside a shipment of gel bra implants from Hong Kong. A further 530 liters were found in art supplies stashed in Sydney. Hide Caption 1 of 8 Photos: The haul is one of the biggest in Australia's history. Hide Caption 2 of 8 Photos: The Australian Border Force said this confirmed what they already knew, that organized crime was getting "very creative" in how they moved drugs around the world. Hide Caption 3 of 8 Photos: The bust equated to 3.6 million individual hits of "ice" being taken off the streets. "Methylamphetamine poses -- by far -- the greatest threat to the Australian public of all illicit drug types, and by a significant margin," said Australian Crime Commission NSW State Manager Warren Gray. Hide Caption 4 of 8 Photos: Four people have been charged over the importation and manufacture of 720 liters of methylamphetamine. Hide Caption 5 of 8 Photos: One Chinese national and three Hong Kong nationals have been arrested. Hide Caption 6 of 8 Photos: Australian Justice Minister Michael Keenan said that all charges could result in life imprisonment. Hide Caption 7 of 8 Photos: Chinese authorities are working with the Australian Police in an effort to try and combat the international "ice" smuggling market. Hide Caption 8 of 8

Australian customs first discovered around 190 liters hidden inside thousands of stick on gel bras in a shipment from Hong Kong in December of last year.

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