Lionel Messi says crowd trouble against Brazil could have "ended in tragedy".

Lionel Messi says crowd trouble during Argentina's World Cup qualifier against Brazil could have "ended in tragedy".

Supporters clashed with police in the Maracana stadium in Rio de Janeiro, leading to the match being delayed by half an hour.

Argentina went on to win the game 1-nil - with Brazil losing a home World Cup qualifying match for the first time.