Brazil organizers beef up security at the Maracana Stadium

Updated JUN 22, 2014 12:40p ET

RIO DE JANEIRO --

Organizers have brought in extra security forces and put up new perimeter fences at the Maracana Stadium after fans broke into the venue at both previous World Cup games there.

Police officers lined up behind the higher fences Sunday at the part of the stadium where nearly 100 Chilean fans forced their way in ahead of Wednesday's Spain-Chile game.

There were also black-uniformed military police, some with dogs, patrolling outside the Maracana for Sunday's match between Belgium and Russia. A special contingent of 600 police, some of them carrying assault weapons, began blocking off streets and setting up barricades before dawn.

The head of military police for Rio de Janeiro state said 600 extra officers would be assigned to the game, bringing the police presence to over 3,000.

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Brazil organizers beef up security at the Maracana Stadium