An explosion has hit a kebab restaurant near a mosque in Villefranche-sur-Saone, in the northern outskirts of Lyon.
No injuries have been reported but the area has been cordoned off by police and firefighters.
Emergency services said the explosion was of "moderate" intensity.
The restaurant's windows were completely blown by the blast.
The incident came a day after 12 people were killed in an attack on the Paris offices of satirical magazine Charlie Hebdo.