ETA: Video
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censorthiis News Violent scenes during United's match in Rome Violent scenes during United's match in Rome
04.04.07
Fans were caught up in violent clashes with Italian police at Manchester United's tie with AS Roma tonight.
A column of riot police with shields and batons were seen moving into a section of the crowd where two St George flags were on display.
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Fans fight police in the Stadio Olimpico
Ugly scenes: Police wade in among the fans in the Stadio Olimpico
It was initially unclear how the clash broke out but it followed earlier reports that five people, including three United fans, had been injured on their way to the Olympic stadium in Rome.
BBC Five Live commentator Alan Green, who witnessed the trouble, said: "United fans appeared to charge the police and the police went in.
"It got pretty vicious. We're about 80 yards away but it seems to have quietened down now.
"We've just heard a loud crash and there is smoke over there.
"It is very, very nasty inside this ground now. "I don't know if the Roma fans started this but they are happy now as it is between the police and the United fans."
Earlier Italy's ANSA news agency said that around 300 English fans were involved in a stand-off before the first leg quarter final tie.
Yesterday United warned the 6,000 fans travelling to the game to take care.
A message posted on the club's website told supporters to avoid certain areas of the city and not to use the city's metro because of a "real danger of being attacked by the 'Ultra' fans of AS Roma".
The warning infuriated some officials in the city, who said it would only excite tensions.
The British fans will be held back for 90 minutes after the game to help dodge confrontations between rival supporters.
Around 5,000 United fans had bought tickets for the game but a further 1,000 were expected to travel without tickets.
The warning spoke of dangers on the Ponte Nenni bridge, the Campo de Fiori or trains to the Piazza Flaminio.
Tonight's earlier incidents were said to have taken place near the Ponte Milvio and Ponte Duca d'Aosta bridges.
Three Middlesbrough fans were stabbed and 10 others hurt during fights with Roma fans at the Uefa quarter finals last year.
Ugly scenes as fans clash in Rome Ugly scenes as fans clash in Rome
Fighting among rival fans was reported before the Champions League quarter-final between Roma and Manchester United on Wednesday evening.
It has been reported that five people were injured in skirmishes between supporters on the way to the Olympic Stadium.
Three were thought to be English, one from Rome and the fifth a member of the security forces.
The trouble reportedly occurred near two bridges - the Ponte Milvio and the Ponte Duca d'Aosta.
After Roma took a 1-0 lead shortly before half-time, both sets of fans threw missiles at each other.
Police moved in using their batons on United supporters.
TV pictures showed one dazed fan with blood pouring from his face with others trying to help him back to his feet.
Meanwhile, announcements were made over the public address system threatening to halt the game.
This is horrid and disgusting.