Lyon, December 22 – An explosion and subsequent fire at the Elkem Silicones plant in Saint-Fons, a commune located near Lyon, on Monday afternoon resulted in four injuries, three of them serious. The incident, which occurred at a high-risk Seveso-classified site, prompted immediate confinement orders for residents in several surrounding communes, affecting approximately 100,000 people. Authorities have since lifted these measures.
Incident Details and Emergency Response
The explosion took place in the early afternoon at the Elkem Silicones chemical plant, situated in the industrial area known as the “Chemistry Valley” south of Lyon. At 4:30 PM, the fire was still ongoing, with emergency services actively working at the scene. The Rhône prefecture confirmed four casualties, three of whom sustained serious injuries.
In response to the incident, authorities swiftly activated the FR-Alert system, sending urgent notifications to residents’ mobile phones. Alarm sirens were also sounded repeatedly across the affected area. The messages instructed residents to “confine yourselves if you are in the area, do not enter the zone, follow authorities’ instructions, and remain in a safe place until the alert is lifted.”
Confinement and Safety Measures
The confinement order initially applied to residents of four communes:
- Saint-Fons
- Vénissieux
- Feyzin
- Pierre Bénite
These measures impacted an estimated 100,000 inhabitants. A 1-kilometer exclusion zone was established around the industrial site, leading to significant disruptions. The A7 motorway was closed in both directions, and both rail and river traffic were halted as a precautionary measure.
Confinement Lifted and Normalization of Traffic
As of 5:52 PM on Monday, December 22, 2025, the Rhône prefecture officially announced the lifting of confinement measures for all four affected communes. Concurrently, circulation on the A7 motorway was reopened, and both railway and river traffic resumed. This decision indicates that the immediate danger posed by the explosion and fire had been brought under control, and the air quality was deemed safe for residents.
The Elkem Silicones plant is classified as a Seveso “upper-tier” site, indicating the presence of dangerous substances in large quantities and requiring stringent safety regulations and emergency preparedness plans. Investigations into the exact cause of the explosion are expected to commence following the complete containment of the fire and securing of the site.
Further updates will be provided as information becomes available from the authorities and plant management regarding the incident’s cause and the condition of the injured individuals.
Source: https://actu.fr/auvergne-rhone-alpes/saint-fons_69199/explosion-dans-une-usine-pres-de-lyon-les-habitants-de-ces-communes-doivent-se-confiner_63611573.html
