Rouen — A plant in northern France that makes a quarter of the world's Nutella has been blockaded for a week by workers striking for more pay, unions said on Monday, in troubling news for consumers of the cocoa and hazelnut spread.

The stoppage has hit the Villers-Ecalles factory of privately owned Italian confectionery giant Ferrero, which normally churns out 600,000 jars per day, making it the biggest Nutella producer in the world.

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