A police statement says the Portuguese Navy and Air Force were involved in the operation, as were European Union police agency Europol and the Lisbon-based Maritime Analysis and Operations Centre - Narcotics, which includes seven EU countries.
The statement today says the drug was in 333 bales and was being taken to a North African country from where it was to be distributed to other countries in Europe and elsewhere.
The operation included Spanish, French, Dutch and Greek authorities.
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