Fans of Peruvian football club Cienciano assaulted the mother of a player from a rival side after she confronted them for shouting racist taunts at her son during a match, media reports said.
Jhoel Herrera's team, Real Garcilaso, were in the final minutes of a 1-1 draw with cross-town rivals Cienciano last Sunday in the southern city of Cusco when his mother confronted a group of fans who were shouting insults at her son, who is black, according to local media.
When the fans reportedly slapped his mother, Herrera, 34, ran to the stands to defend her, leading to a fight that had to be controlled by the police.
"We firmly condemn and repudiate this latest case of racism in Peruvian football," said the head of the Peruvian football association, Renzo Sanguinetti, adding the league would "punish those responsible."
Cienciano apologized to the player and his family and said the fans had no ties to the club.
The team have been involved in racist incidents in the past.
In March, Panamanian forward Luis Tejada from club Juan Aurich left the pitch mid-match after Cienciano fans made monkey noises whenever he touched the ball.
The club was fined $12,000 over the incident and ordered to play one match with no fans present.