A May Day demonstration erupts in Paris as France fumes over an increase in the retirement age.

Clashes erupted in Paris on Monday marking May 1, a traditional day of union-led marches, in the wake of hugely unpopular changes to France’s pension system. A building caught fire at Place de la Nation as the French capital turned into a pitched battle between protesters and riot police. Around 112,000 people took part in the protest, the second-highest turnout since demonstrations against pension reform began this year. Police charged at protesters under the cover of a water cannon and were confronted with a barrage of fireworks and stones torn from the square. A total of 291 detentions across France, 90 of whom were apprehended in Paris, and more than 100 policemen were injured in May Day protests, including 19 in Paris with one policeman suffering serious burns from a molotov cocktail.

This comes after one of France’s largest unions, the CGT, had called for “historic” protests following months of unrest and widespread strikes. Despite the decision, some of France’s powerful unions say they will fight on, with the question now whether this anger will plague the rest