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UEFA's executive committee claimed "it will not hesitate to impose additional sanctions including the potential disqualification of their respective teams".

And the British Government has offered to send more UK police to France ahead of England's next game against Wales in Lens following violence in Marseille.

It comes as two supporters were left in "critical" condition when Russian thugs stormed English fans after yesterday's draw in the Stade Velodrome.

Uefa was swift to open disciplinary proceedings against Russia for crowd disturbances, racist behaviour and the setting off of fireworks towards the end of the game.

Shocking footage emerged earlier showing Russian fans attacking the English INSIDE the stadium.

But now, the governing body has gone one step further in a strongly worded statement.

It reads: "The Uefa Executive Committee would like to express its disgust for the violent clashes which occurred in the city of Marseille.

"Such unacceptable behaviour by so-called supporters of the national teams of England and Russia has no place in football, a sport we must protect and defend.

"The Uefa Executive Committee has warned both football associations that it will not hesitate to impose additional sanctions.

"This could include the potential disqualification of their respective teams from the tournament, should such violence occur again.

"We urge both the FA and the RFU to appeal to their supporters to behave in a responsible and respectful manner.

"We would also like to publicly voice our support for the work of the French authorities and security forces for their efforts to deliver a safe and secure tournament in challenging circumstances."

The FA has since added that it takes the threat "with the utmost seriousness".

Yesterday, wheelchair-bound England fans were pictured cowering among the violence as dad's desperately tried to carry away their children.

England drew with Russia in their opening game of the tournament last night – after a last-gasp equaliser from Vasili Berezutski.

Even Jamie Vard'ys wife Becky was caught up in the carnage – claiming French police "teargassed her for no reason".

The events are a bloody reminder of the hooliganism associated with English football.

Disqualification would strike parallels with the ban on English clubs from European competition after the Heysel stadium disaster of 1985.