A BRAZILIAN police officer has been captured on video apparently firing a live pistol round at anti-World Cup protesters near Rio de Janeiro's Maracana stadium.

During the protest, another man in plain clothes, who identifies himself as a police officer, also pulls out a pistol and fires two shots into the air near the stadium, where Argentina were playing Bosnia- Herzegovina.

Government spokesman Pedro Dantas said there had been no reports of anyone suffering gunshot injuries.

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The incident took place at around the start of the group match between Argentina and Bosnia-Herzegovina, the first World Cup finals game to be played in the Maracana stadium since 1950.

Earlier, officers had fired stun grenades and tear gas to block a march by about 200 protesters heading towards the stadium.

A stand-off ensued, with demonstrators holding banners massing near a police line guarding the route to Maracana. The Protesters chanted "Fifa, go back to Switzerland".