A record drugs bust in Melbourne has "severed the head" of an international crime syndicate, according to police.
Four alleged members of a transnational crime syndicate operating in Melbourne have been charged and more than 560kg of liquid methamphetamine has been seized.
Australian Federal Police say it is the largest importation of liquid methamphetamine in Victorian history, worth more than $123 million, and the second-largest nationally.
The federal police ran an operation with the Australian Border Force and Victoria Police once border force officials detected the drugs in Melbourne.
The liquid meth was found on November 11 in more than 1600 mustard bottles, sent as air cargo from Chicago.
"We have dismantled an international crime syndicate - we have severed the head of the snake," said Victoria Police Assistant Commissioner Bob Hill.
AFP Assistant Commissioner Bruce Giles said there were a number of raids in suburban Melbourne on Friday and across the weekend.
A 29-year-old man from Sunshine, a 28-year-old St Albans man, and a 34-year-old man and woman from Albion were arrested.
They face charges including importation of commercial quantities of border controlled drugs.
Mr Giles said police also found several kilograms of what is believed to be commercial quantities of heroin and meth at an Albion location, as well as a clandestine laboratory in St Albans.
He added further arrests are not being ruled out.
"This operation shows that criminals continue to prey on our community, causing drug-related crime and misery, along with associated health and social costs," he said.
ABF Assistant Commissioner Phil Brezzo said their officers had "seen everything" when it came to drug importation.
"There are varying levels of sophistication and this one is up there," he said of the seized shipment.
Australian Associated Press