National police and an Interior Ministry official who spoke on condition of anonymity because he wasn’t authorised to speak about the developing situation both said that four children were among the wounded.
Police said two of the children suffered life-threatening injuries and that the other two were lightly injured.
Police said one adult also suffered life-threatening wounds.
Both police and the Interior Ministry official cautioned that the number of wounded could evolve because the full details weren’t yet clear.
In Paris, politicians interrupted a debate to hold a moment of silence for the victims.
The assembly president, Yaël Braun-Pivet, said: “There are some very young children who are in critical condition and I invite you to respect a minute of silence for them, for their families, and so that, we hope, the consequences of this very grave attack do not lead to the nation grieving.”