Police authorities seized more than 2.6 tonnes of cocaine and arrested four people in a major international operation in the Atlantic Ocean, Italian officials said Monday. The street value of the cargo is approximately €500 million euros, Italian police said. "The wholesale value of the cocaine is estimated at approximately €78 million. Using these vessels, organised crime groups can recover illicit cargoes dropped by sea by ships arriving from South America. The speedboat was stopped off the coast of Lisbon by Portuguese authorities, conducted in cooperation with Spanish and Italian counterparts.