Smoke bombs launched from outside the Geoffroy-Guichard stadium in Saint-Etienne caused the start of the fire to be quickly brought under control, an AFP journalist noted on Saturday evening.
Saint-Etienne lost to Reims 2-1 at the end of a match of the 37th and penultimate day of the French football championship played behind closed doors, approaching relegation.
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A group of supporters who came outside the stadium launched projectiles reaching a television control van and causing the start of a fire quickly brought under control by security, noted an AFP journalist.
The police repelled about fifty individuals.
Saint-Etienne had been sanctioned with a match behind closed doors due to the indiscipline of an ultra group during the ASSE-Monaco match (1-4), on April 24, during which hundreds of pyrotechnic devices had been used.