Australia makes largest meths seizure

The drugs weighed a total of 585kg (1,290 pounds) and had an estimated street value of A$430m ($440m: £291m).

They were found last Friday in a container of chemicals from Shenzhen.

Three men - a Singaporean, an Australian and a Hong Kong man - have been arrested and are due to appear in court in Sydney on Thursday.

They face a maximum life sentence if found guilty, Kazinform has learnt from BBC News.

At a news conference, Australian police said the drug, known as "ice", was seized following a four-month investigation triggered by a tip-off by a member of the public about suspicious activity at storage facility in West Ryde, Sydney.

"This is a hideous, insidious drug. This is the sort of drug that sends people mad," said New South Wales Police Commissioner Andrew Scipione.

"That one phone call was the one thread that allowed us to pull and unravel a syndicate that will be stopped forever."

The investigation involved the Australian Federal Police (AFP), Customs officials, New South Wales Police and the Australian Crime Commission.

AFP Commissioner Tony Negus said the drugs syndicate had gone to "considerable lengths to escape detection", but that the police operation was not yet over.

"We've not ruled out further arrests either here in Australia or overseas," he said.

"We've already been in contact with authorities in China and a range of further inquiries are under way."

The haul is nearly double the size of the last record haul of 300kg, made last year.