Four British men have been arrested in Australia and New Zealand following a drugs operation targeting a UK organised crime syndicate.
Queensland Police said officers seized 766kg of MDMA powder on Tuesday in one of the region’s biggest busts.
The drugs haul had an estimated value of 90 million Australian dollars (£50 million).
Police said the MDMA was the highest purity recorded in Queensland and could have made up to 12 million pills.
The force arrested two UK citizens in the state, a 51-year-old man and a 40-year-old man, as well as a 26-year-old Australian man.
A 51-year-old Australian woman was arrested in New South Wales in connection with the seizure of approximately 108,000 Australian dollars (£61,000) in cash.
Two other British men, aged 60 and 49, were arrested by police in New Zealand after 200kg of methamphetamine was seized last week as part of the same operation.
Detective Superintendent Jon Wacker, of Queensland State Crime Command’s Drug and Serious Crime Group, said the MDMA seizure represented around 7% of the national yearly total in Australia.
“We believe the drug would have been diluted with other agents and had the potential to make between six and 12 million capsules,” he said.
“Organised crime syndicates are making significant profit at the expense of our Australian community but more importantly they are placing our young people’s health at risk.
“This operation has been focused on targeting and dismantling this organised syndicate.”
The UK’s National Crime Agency was involved in the investigations, alongside police in Australia and New Zealand, the Australian Border Force, the Australian Criminal Intelligence Commission (ACIC) and other agencies.
Katie Willis, from the ACIC, said it was estimated that more than 1.1 tonnes of MDMA is used in Australia each year.
“Removing 766kg of MDMA before it reaches our streets will have an immeasurable impact on the illicit MDMA market,” she said.