There have been two arrests for the brawl between Roma and Napoli ultras on a motorway, but they have already been released.
The clashes occurred in Tuscany on the A1 at a motorway service station called Badia Al Pino, which is where Lazio DJ Gabriele Sandri was accidentally shot by a stray police bullet during another fight.
Roma supporters were on their way to the Milan game at San Siro on Sunday, while Napoli fans were travelling to Genoa for the Sampdoria match when they crossed paths and started throwing objects at each other.
The situation deteriorated when they got out of their buses and began brawling in the road.
According to La Repubblica newspaper, Roma ultras Emiliano Bigi and Filippo Lombardi were arrested, but have already been released.
The magistrate opted not to confirm the arrest because they were not caught in flagrante, nor did he recognise the urgency of keeping them behind bars to avoid repeat brawls.