Riot police had to protect the referee as River Plate beat Gremio. River Plate won with a late penalty to reach the Copa Libertadores final. Riot police circled the referee, Andres Cunha, as River Plate beat Gremio 2-1. Bressan conceded a penalty for handball and was sent off by referee Cunha. Riot police force to protect referee Cunha from livid Gremio players.