As the Riviera supporters entered the parking lot reserved for them, several of them fought with members of the Bordeaux group North Gate.
Despite a high gate separating them, exchanges of blows took place across, noted an AFP journalist.
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Coupe de France: schedule and results
These incidents lasted a good ten minutes, requiring the intervention of CRS based outside the enclosure, who took to the stands to separate the two warring camps.
The match started four minutes late after the Nice supporters returned to the parking lot reserved for them.