Police say two Palmeiras fans have been shot before a Brazilian league match in Sao Paulo.

Police said Sunday that oen person was hospitalized in serious condition and was undergoing surgery after being hit in the waist region, while the other was recovering after being hit in the leg.

Police officer Thiago Cesar told the SporTV channel it remained unclear who fired the shots, which came after supporters from Palmeiras and Corinthians got into a confrontation just outside the Prudentao stadium in Presidente Prudente.

Police had to fire rubber bullets to keep the situation from escalating.

Palmeiras won the match over the Sao Paulo city rival 2-1.