Youths smashed the windows of banks and threw objects as protesters over labour reforms clashed with police in the western city of Nantes.
What's the optimum driving speed? Can you rely on jerry cans? Plus real-time information on how low fuel has got at French petrol stations.
Dozens of flights have been cancelled as air traffic controllers join the strike action in France.
The UK government warns people travelling to France that strikers blockading oil refineries have caused some stations to be without petrol.