Two Britons were among seven people stabbed in a knife attack in Paris, local media reports.
One man has been arrested after the attack, which took place on the banks of a canal in the north-east of the city at just after 11pm local time on Sunday.
A man armed with a knife and an iron bar is said to have attacked people and four were left seriously injured.
French newspaper Le Parisien said one British tourist has a chest injury while another was stabbed in the head.
The publication added the perpetrator stabbed three people near a cinema on the Bassin de la Villette, and men playing petanque nearby attempted to stop the man, with one throwing a ball at him.
It is reported a man of Afghan nationality has been arrested and the incident is not being treated as terrorism, police said.
The Foreign Office said: “We are urgently investigating this incident and are in close contact with the French authorities.”
The Paris prosecutors’ office is handling the investigation.
The Quai de la Loire area of Paris includes the Villette Canal Basin and has a number of cinemas and restaurants.