Explosion and Fire at Elkem Silicones Plant Near Lyon Injures Four, Three Seriously

Explosion Rocks Elkem Silicones Plant Near Lyon

An explosion and subsequent fire occurred on Monday, December 22, 2025, at the Elkem Silicones plant in Saint-Fons, located south of Lyon, France. The incident resulted in four individuals sustaining injuries, with three of them reported as serious. Local authorities promptly issued advisories for residents in nearby communes to shelter indoors and avoid the affected area, although officials confirmed there was 'no risk of toxicity' to the public.

Incident Details and Emergency Response

The blast, believed to be a hydrogen explosion, originated in an experimental workshop at the facility around 2:30 pm. The explosion ignited a fire within a 600-square-meter building on the site. The Elkem Silicones plant is classified as a Seveso site, indicating a potential risk to health and the environment. Approximately 100 firefighters and 30 emergency vehicles were deployed to the scene to tackle the blaze, which was brought under control by early evening.

Public Safety Measures and Disruptions

Following the incident, the Rhône department prefect advised residents in Saint-Fons, Feyzin, Pierre-Bénite, and Vénissieux to stay indoors as a precautionary measure. Alerts were disseminated via the FR-Alert system to over 100,000 people in these communities. A 1-kilometer security perimeter was established around the facility. The incident also led to significant transportation disruptions, including the closure of the A7 motorway in both directions, and the suspension of rail traffic on the Lyon-Valence-Marseille and Lyon-Saint-Etienne lines, as well as river navigation. The confinement order was lifted around 6 pm after the fire was contained.

Injuries and Ongoing Investigation

All four injured individuals were employees of Elkem Silicones. While three suffered serious injuries, some reports specified two in critical condition and one with serious injuries, or three with severe burns. Jean-Pierre Laurent, the site director, suggested that hydrogen emanation in the experimental workshop was the likely cause of the explosion. An investigation has been launched to determine the exact circumstances that led to the incident.