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 coastal city.
Police used tear gas for a third day on Saturday, as footage also showed bottles being thrown and bloodied fans being given medical treatment.
BBC News correspondent Nick Eardley, who is at the scene on Saturday, said bottles were being thrown "every couple of minutes" and described the situation as "pretty terrifying", as fans also fought with Russian supporters.
Six arrested
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.
Police told the BBC that six people had been arrested and 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 shocking scenes on social media, and pointed the finger at a gang of black-clad Russian hooligans, who they said had entered the port city's main square from a side street seeking violence.
Chris Slegg, a BBC London reporter on holiday in Marseille for the football, said he had been at a bar with friends and other fans on Friday night, watching France's game against Romania, and the atmosphere had been friendly.
However, shortly after the match finished, a group of 20 to 30 French youths had emerged from side streets and thrown firecrackers and bottles at people who had been watching the game outside the bar, he said. The incident had been completely unprovoked, he said.
Style of policing
Dave Tomlinson, from the Football Supporters' Federation, who is in Marseille, told the BBC it had been "disappointing to see any problems" involving England supporters.
"We understand from the reports that it's a very small minority of England fans that have been involved," he said.
"We also understand that unfortunately there has been quite a lot of provocation from the French and also the Russian elements that are in the area."
He also said the style of policing was "a little bit different" from what England fans would be used to.
"The first option at the moment seems to be that the French police are going to put tear gas in the areas where there are potentially going to be problems."