Rome police say dozens of fans of Italian team Lazio wielding cobblestones, knives and metal rods attacked Tottenham supporters out drinking before their Europa League match.
At least one person was stabbed Thursday, and seven were hospitalized.
The brawl took on anti-Semitic overtones, with witnesses reporting that the Italian hooligans shouted "Jews" at the Tottenham fans.
Tottenham supporters are often called the "Yid Army," and the team is known to have a large Jewish fan base from north London. Lazio fans are traditionally right-wing and often use fascist salutes and slogans.
Rome police say they detained some of the 50 or so hoodlums responsible for assaulting the British fans and trashing "The Drunken Ship" pub in Rome's Campo de' Fiori square, a popular drinking spot.