UEFA has threatened Russia and England with disqualification from euro 2016 over fan violence.
It follows days of violence in Marseille involving French people, as well as Russia and England supporters.
And England fans were attacked by Russian supporters inside the stadium in Marseille as Russia and England drew 1 - 1 on Saturday.
UEFA has started disciplinary proceedings against Russia, but a statement says both sides could be thrown out of the tournament if violence reoccurs.
UK correspondent Olly Barratt says the governing body itself is also facing scrutiny.
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