STOCKHOLM (Reuters) - Swedish graffiti artists kidnapped a fiber-glass cow from the international art exhibit CowParade, held power drills to its head and threatened to "sacrifice" it unless the sculptures were declared "non-art."

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"We demand that the cows are declared non-art. Otherwise the hostage will be sacrificed," said a voice on the video. The group gave the organizers of the Stockholm exhibit till noon on Aug. 23 to comply with their demand.

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Vandalism marred the Prague show, prompting ex-president Vaclav Havel, who decorated one cow, to say: "Maybe some people can't bear to look at anything nice, unusual or ornamental, maybe they can't even bear to look into the mirror."