Seven Manchester United supporters have been taken to hospital after violence flared before the Champions' League clash with Roma in Italy.
British Embassy officials in Rome said five fans received stab wounds while two others, including a 16-year-old boy, needed treatment for being drunk.
None of the stab victims is understood to have serious injuries following the clash between the rival fans outside the Stadio Olympico.
Most are expected to be released by the end of the night, said an embassy spokeswoman.
Earlier the Foreign Office said two British nationals were arrested but embassy staff said they could not confirm if anyone had been detained.
Italian media have reported that six British nationals were arrested by police.
The embassy spokeswoman said: "Seven Manchester United supporters were taken to hospital after fighting broke out on the Pont Duca d'Aosta bridge which fans cross over the river to get to the stadium.
"The situation in the stadium is now fine and everything is running smoothly." She added she could not confirm if any Britons had been arrested.
The embassy had warned travelling fans beforehand not to use the Pont Duca d'Aosta bridge because it was habitually used by Roma's notorious Ultras - a following of hardcore fans.
Scenes of violence and disorder marred the two clubs' Champions League games last season, although this season's group match in Manchester in October passed off peacefully.
