Australian Federal Police have helped uncover a 700 kilogram haul of MDMA in the Netherlands allegedly bound for Queensland.

Key points: The AFP said the entire haul had an estimated street value of $301 million

The AFP said the entire haul had an estimated street value of $301 million Authorities believe the syndicate have successfully imported drugs to Australia previously

Authorities believe the syndicate have successfully imported drugs to Australia previously Barns and rural outhouses were among the 15 locations searched by European authorities

The drugs were intercepted in the Dutch city of Rotterdam three months ago — part of an international police operation that has led to arrests in three countries.

It is understood the 700kg of MDMA was found in cans of tomatoes in a shipping container.

The AFP said the entire haul had an estimated street value of $301 million.

The drugs were intercepted in the Dutch city of Rotterdam. ( Supplied: Australian Federal Police )

"We believe that this criminal network would have been able to produce thousands of kilos of MDMA — equivalent to tens of millions of pills which was likely destined for Australia," Commissioner Reece Kershaw said.

Eleven people were charged in relation to the seizure including a 48-year-old woman from Bass Hill in New South Wales who was extradited to Brisbane.

She will face court next month charged with attempting to possess a commercial quantity of border controlled drugs.

Two other Australians are also under investigation.

An investigation by the National Police of the Netherlands into a "sophisticated criminal syndicate" led to raids at 15 locations in that country and in Belgium earlier this month where more drugs and 50 tonnes of precursor chemicals were seized.

Dutch police said the chemicals were hidden behind double walls, double ceilings and double floors in barns and residences.

Search warrants were executed on 15 locations in the Netherlands and Belgium over a $300 million MDMA drug bust. ( Supplied: AFP )

Assistant Commissioner of the Dutch National Criminal Investigations Division, Andy Kraag, said authorities "set a trap" in order to catch the alleged masterminds.

Commissioner Kraag said the investigation was generated by the Australian authorities who provide information to the Netherlands national police.

He said a father and son who had a "low profile" were believed to be the leaders of the syndicate.

The AFP said in total 850kg of MDMA was seized, with the potential to be made into approximately 8.5 million tablets in Australia.

Netherlands Police also seized precursor chemicals which the AFP said was capable of producing another 658kg of MDMA.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 1 minute 21 seconds 1 m 21 s The operation involved the Queensland Joint Organised Crime Taskforce and the Netherlands' National Police

Queensland Police Deputy Commissioner Tracy Linford said in total the drug seizure had the potential to make 15 million pills.

Home Affairs Minister Peter Dutton said the drugs could have hit the streets of the Gold Coast in time for Schoolies.

"We have seen drug dealers specifically target Schoolies … the fact that the timing would have meant that these pills are hitting the street and specifically here in Queensland at a time just before Schoolies," he said.

Commissioner Kraag said more arrests were possible.

"We need to follow the money because those criminals are in it for making lots and lots of money."

It comes just three months after another major investigation by the AFP and Queensland police seized the third-largest batch of MDMA in Australian history.