Not sure what's going on, not hitting TV news channels yet but seems something is going off. I have seen mention of drugs so perhaps not jumping to conclusions right now is sensible.
Nothing on BBC, Telegraph, or Guardian.
DM, Express, Mirror and Reuters all have it.
Unless you're holidaying there, this news story has no bearing to international audiences.
If it's somewhere like lille or toulouse I wouldn't be surprised if it's gang related.