Fans of Uruguay’s Penarol and Brazil’s Palmeiras clashed at the Campeon del Siglo stadium in Montevideo at the end of their Copa Libertadores game on Wednesday night.
The violence erupted at full-time after Palmeiras had claimed a 3-2 victory over their Uruguayan hosts.
There had earlier been clashes between fans and cops outside the stadium.
According to Uruguay’s Interior Ministry, 30 fans were arrested and 18 cops were injured.