Eleven Egyptian policemen were injured in Cairo on Sunday after Egyptian club Al-Ahly defeated Tunisia's Esperance in the first leg of the Orange CAF Champions League semi-finals, played at the 75,000-seater Cairo Stadium.
Angry Tunisian fans protesting the 2-1 loss of their side ripped out stadium seats, threw them about and hurled fireworks into the pitch.
The Egyptian police say dozens of Tunisians were arrested after policemen rushed into the stands to stop the fans from rioting.
An Egyptian TV showed live footage of half-naked Tunisian fans beating up and kicking policemen.
The Tunisian fans were certainly irked by the referee’s ignoring of a hand ball goal that put Al Ahly in the lead seven minutes before halftime.
Teams from North Africa, whether national or club sides, have a history of game violence fuelled mostly by ego and accusations from team officials and fans.