The floating roof of a 15,000-m³ storage tank containing platformate (a mixture close to that of gasoline) sank for an unknown reason. This immersion was detected at 9:40 pm. Despite spreading the foam in an effort to prevent fire, lightning caused the product to ignite on November 7 at around 9:45 pm during a violent thunderstorm, once the foam layer had been weakened by the downpour. The fire was contained within 40 min through deploying in-house response teams. The volume of hydrocarbons destroyed in the fire was estimated at 400 m³; moreover, 25,000 litres of emulsifiers were consumed. Property damage estimates amounted to 2.2 million francs.