ROME, Oct 1 (Reuters) Rival fans clashed in Turin ahead of the derby match between Juventus and Torino.
The Italia 1 television channel showed footage of the clashes yesterday and reported that 15 fans had been arrested.
It has been a bad week for soccer-related violence in Italy.
Two Inter Milan fans received hospital treatment for stab wounds after being attacked by AS Roma supporters before Saturday's game in the Italian capital.
Last Sunday's derby between Sampdoria and Genoa was marred by clashes before kick off.
Earlier that day, Rome police arrested 66 Lazio fans, some armed with knives, machetes, clubs and knuckle-dusters, before they could set off for a match against Atalanta in Bergamo.
The Italian Foreign Ministry has warned Roma supporters of possible trouble on Tuesday when their side visit Manchester United in the group stage of the Champions League.
Both legs of last season's quarter-final between the sides were marred by violence.
The ministry told fans to ''behave correctly and prudently''.
Italian soccer has been beset by crowd trouble in recent years and is still recovering from the death of a police officer at a Serie A game in Catania in February.
Reuters BJR DB0934