Danish police say a European drug ring is being broken up with 310 kilograms (682 pounds) of cocaine of "unusually high purity" seized in Denmark and six arrests in Belgium and the Netherlands.

Police spokesman Brian Voss Olsen says the cocaine could have been cut to up to 1.2 tons of powder and sold with estimated street value of up to 900 million kroner ($131 million).

Voss Olsen says "the largest cocaine seizure in Denmark's history" took place in the western Denmark port city of Esbjerg in July, and "likely was intended for the European market."

He said none of those arrested were Danes, and one had already been extradited to Denmark, adding more arrests could be made. Details were disclosed only on Tuesday because of the ongoing probe.