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Police allegedly fire percussion grenades inside the Estádio Castelão as fans fight following the end of the Ceará state championship final, which was won by Fortaleza.

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Police reportedly fired percussion grenades inside the Estádio Castelão as fans fought following the end of the Ceara state championship final.

The 2-2 draw at the 2014 World Cup stadium on Sunday gave the title to Fortaleza, who had beaten their city rivals Ceara 2-1 in the first leg last week.

Fortaleza fans invaded the pitch to celebrate but attacked their rivals with sticks, seats and even parts of the stage being prepared for the prize-giving ceremony.

Police fired smoke bombs in a bid to try and clear the pitch.

The 63,000-seat stadium was completely rebuilt for the World Cup last year and hosted six games, including two that featured the host nation.

There was also trouble at a World Cup venue in Porto Alegre. Gremio lost the state title and their fans ripped up seats in Internacional's Beira-Rio stadium, forcing police to use pepper spray.