updated 11/12/2010 10:01:22 AM ET 2010-11-12T15:01:22

Spanish customs say police have arrested three Dutch citizens and seized at least 20 metric tons (22 tons) of hashish from a boat off the southern coast in one of the country's largest maritime drug busts in a decade.

Customs said the police found the hashish aboard the "Nancy-II" fishing vessel some 120 miles (193 kilometers) off the southeastern coast after it had picked up the load in Morocco.

The department said Friday this was Spain's biggest drug seizure at sea in a decade and one of the five largest busts ever.

Authorities had monitored the boat since it had docked in northern Spain earlier this month before sailing to Morocco.

The three Dutch crew members were to be taken before a judge in the southern port of Cadiz.

In a separate operation, Spanish police concluded a large scale investigation Friday that has led to 3.4 metric tons (3.8 tons) of cocaine being seized in two countries and 65 persons detained, authorities said.

The drugs were impounded in Argentina and Brazil thanks to international cooperation by several police forces, the Interior Ministry said in a statement.

Of those detained, 20 are being held on suspicion of drug trafficking, 20 on suspicion of money laundering and 10 were detained in Argentina, while 15 were picked up in Spain during the first phase of the investigation in June, the ministry said.

Among items also seized were euro5.5 million ($7.5 million) in cash, 65 luxury vehicles and six sports yachts, the statement said.

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