Italy has launched an international alert over possible contamination of mozzarella cheese after balls of the creamy white delicacy turned blue.
Police seized 70,000 mozzarella balls from supermarkets after receiving reports from consumers around the country that as soon as they slit open the plastic packets encasing the cheese, it changed colour.
The tainted mozzarella has been dubbed "smurf cheese" after the blue-skinned cartoon characters.