England fans have been embroiled in fresh clashes with police and rival supporters in Marseille ahead of the team’s opening match of Euro 2016.
The latest violence follows two nights of trouble in the French city.
Police used tear gas for a third day on Saturday, and also a water cannon in an attempt to disperse the crowds.
Footage showed bottles being thrown and bloodied fans being given medical treatment. French police say one Briton was seriously injured in clashes.
A police spokesman said the Briton had been resuscitated by officers, but gave no further details.
Earlier on Saturday, shadow home secretary Andy Burnham said England fans’ behaviour was “embarrassing”, given the terrorism threat to France.
BBC News correspondent Nick Eardley, who is in Marseille, described the situation earlier as “pretty terrifying” as fans fought with Russia supporters.
He said he had witnessed bloodied England fans being “dragged away by police”, to the sound of sirens blaring out across the city’s main square.
Six arrested
Police told the BBC that six people had been arrested and at least five had been injured during the scuffles.
Local police chief Laurent Nunez told AFP news agency: “Police intervened in a clash between English, Russian and French supporters in the Vieux Port district.”
Some British journalists in the area have described the scenes on social media, and pointed the finger at a gang of black-clad Russians, who they said had entered the port city’s main square from a side street apparently seeking violence.