Winemakers staged a protest by destroying Spanish bag-in-box wines at a branch of the Carrefour supermarket near to Montpellier in France’s Languedoc-Roussillon region, according to French media reports.

Tension over cheap Spanish wine imports has reached boiling point in Languedoc as the French presidential election approaches.

Thousands of winemakers marched through the streets of Narbonne in the region earlier this month to complain at the unfair competition that they face from Spain and about the lack of government support for their industry.

Militant winemaker group CAV – or CRAV as it is sometimes known – has attacked lorries carrying Spanish wines and set fire to importers’ offices in the past year.