Tunisian police and security forces clashed with Algerian fans in the closing stages of their team's African Nations Cup 3-1 quarter-final defeat to Morocco here on Sunday.
Trouble began just after Youssef Hadji had put Morocco 2-1 in front in extra-time after Algeria had led the match into injury-time at the end of 90 minutes.
A section of the 20,000 Algerians inside the compact Taieb-Mhiri Stadium started ripping up seats and throwing them on to the pitch as they watched their team's cup dreams die.
It was then that police in riot gear charged on to the terraces to scatter the fans and escort them from the ground.
By the full-time whistle, large parts of the stadium were empty as Algerian supporters left in their droves.
Sunday's incidents were not the first to involve Algerian supporters at the tournament.
The country's football federation was fined 5,000 dollars following disturbances during the 2-1 win over Egypt in the group stages.
The fine, handed out by the African Football Confederation, was for "unsporting behaviour" by some fans who threw various objects on to the pitch and into the VIP areas.
One spectator was hurt in the incident.
Algerian fans also brought shame to their country two years ago when their side met bitter rivals Egypt in a crucial World Cup qualifier at Annaba which ended in a 1-1 draw.
Egypt, whose chances of making it to the finals depended on a victory, appealed to have the match replayed after Algerian fans threw missiles on to the pitch leading to a 15-minute stoppage.
Egypt were leading 1-0 at the time but, after the game resumed, the Algerians equalised and it was Senegal who qualified from their group for the finals.
The violence spilled on to the streets after the match with the Egyptian team bus being stoned. Egypt also claimed that their national flag was burnt by Algerian fans.