Five English football fans have been injured after being attacked by knife-wielding Ultras in Italy.
Up to 50 fans of the Rome club Lazio targeted a group of Tottenham fans ahead of a Europa League match between the two clubs tonight in the Italian capital.
The English supporters were enjoying drinks in the Drunken Ship in the historic Campo de Fiori at 1am on Thursday when the attackers - wearing motorcycle helmets and brandishing weapons including knuckle-dusters, broken bottles, and baseball bats - smashed their way in.
Sources named four of the injured as Ashley Mills, Dave Lesley, Stephen Tierney and Christopher Allen.
Mr Mills is said to have been stabbed and was seriously ill in the city's San Camillo Hospital.
A spokesman for the mayor's office said the attack was "obviously organised".
A spokesman for Tottenham said: "We understand from local police that nine of our supporters suffered injuries last night following an incident in the city centre.
"Three of these supporters were taken to hospital for further treatment. We continue to seek further information and are liaising with both Italian and UK police on this matter."
Italian newspaper La Repubblica reported scenes of "urban warfare" as the Ultras - notorious Italian football thugs - attacked the English fans.
The bar was wrecked in the attack and two tourists are also thought to have been injured. Rome police said the victims included a Californian and a Bangladeshi.
One witness told La Repubblica: "We feared the worst."
This morning, there was no response from the American-owned bar, which is situated in one of the most visited squares in the centre of Rome.
The square is known for its colourful food market and nightlife and the bar is renowned for its lively atmosphere.
Three victims are being treated at the Holy Spirit Hospital and three others at Fatebenefratelli.
A police spokesman said: "A group of about 40 or 50 people in motorcycle helmets or with their faces covered were armed and attacked the group of English football fans drinking in Campo de Fiori square."