Police seize $900 million worth of meth hidden in bras

Gel bra inserts (foreground L) containing concealed crystal methamphetamine is seen at the Australian Federal Police headquarters in Sydney on February 15, 2016. Australian police have seized more than 712 million USD in crystal methamphetamine, or ice, some concealed in gel bra inserts in one of the country's biggest drug busts. AFP PHOTO / Saeed KHAN / AFP / SAEED KHAN (Photo credit should read SAEED KHAN/AFP/Getty Images)

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Gel bra inserts (foreground L) containing concealed crystal methamphetamine is seen at the Australian Federal Police headquarters in Sydney on February 15, 2016. Australian police have seized more than 712 million USD in crystal methamphetamine, or ice, some concealed in gel bra inserts in one of the country's biggest drug busts. AFP PHOTO / Saeed KHAN / AFP / SAEED KHAN (Photo credit should read SAEED KHAN/AFP/Getty Images)

The Associated Press contributed to this report.

It is the country's largest seizure of the drug in its liquid form, officials said.

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The shipment of 190 gallons of the drug could be used to make about 1,100 pounds of crystal meth, according to Chris Sheehan, Australian Federal Police commander.

Four passport holders from Hong Kong were arrested. Australian and Chinese law enforcement developed a task force last November to combat methamphetamine trafficking.