Six Russian supporters have been arrested in France, on suspicions they could pose a threat to public festivities.
The supporters, who have not been named, were arrested following clashes before the England v Russia match in Marseille on Sunday.
They were arrested in Marseille and Nice on Tuesday.
New footage has emerged appearing to show England fans in Lyon being attacked by a gang thought to be so-called "ultras".
Police have called violence at the European Championships in Lille "appalling" and "absolutely vile".