Three fans were injured in a shooting after a match at a World Cup stadium in Brazil at the weekend.
The fans' injuries were not life-threatening.
Police officer Francisco Araujo Silva told the sports daily Lance that the shots were fired by two men riding a motorcycle as local America supporters left the Arena das Dunas in the north-eastern city of Natal yesterday.
It was not the first incident involving fans in Natal this year. Before the stadium's inauguration in January, police arrested two men who shot at a group of rival fans just a few miles away.
Fan violence has been common in Brazil as it finalises its World Cup preparations.
Just a week ago, Corinthians fans invaded the team's training centre and threatened players.