Two people were killed and 51 injured in Morocco's largest city on Saturday when rival fans of its Raja de Casablanca football club brawled after a home game.
The running battles, in which the rival fans threw flares and ripped up parts of the Mohammed V stadium, came despite a 2-1 victory for the home team over Chabab Rif Al Hoceima of Al Hoceima in northern Morocco.
Moroccan media said 11 cars parked on streets outside the stadium had been pelted with stones.
Security forces eventually quelled the violence and the injured were evacuated to hospital, authorities said.
Prosecutors have opened an inquiry into the fan trouble and police have already made 10 arrests.