Riot police fired tear gas to disperse groups of rival fans before they could start a fight.

Before the emergence of these groups, when a team played as a visitor, was pressured by rival fans.

Police feared many more might make the trip, making it impossible to separate rival fans.

The system also resulted in chants and songs being directed sideways to the rival fans, rather than across the pitch to the other end.

She said rival fans had attacked one another and battled the police who intervened.

The banner became the subject of ridicule from rival fans, and has since been removed.

A year ago, another young man jumped from a train and to his death in Sicily as he tried to flee attacking rival fans.

During the game, attention was turned from the action on the field to discomforting rival fans.

The vote was almost stopped, as it was taken over by rival fans.

From here police and stewards are directed to the slightest hint of trouble between the rival fans.