The security breach which saw around 30 ticketless fans break into Rio de Janeiro's Estadio Maracana in an attempt to watch Argentina's clash with Bosnia-Herzegovina on Sunday was a minor and isolated incident, according to Fifa and Brazil 2014's local organising committee.
During the incident, which was caught on a video subsequently posted on YouTube, a number of fans scaled an outer wall of the stadium while many more burst through a security gate, with stewards seemingly unable to stop them.
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"Those who jumped the wall were led to the police and the Plan B worked well," Milesi told reporters during a Fifa press briefing at the Maracana on Monday.
"[The supporters] have a police record and that sends a message to those who are here to make trouble.
"We had a meeting yesterday to reinforce security at the stadiums. It's very important to us. We had a great festival [at the Maracana] last night because everyone felt safe here."
Argentina's 2-1 victory over Bosnia attracted 74,738 people to the Maracana, the largest attendance of the World Cup so far. The number of ticketless supporters arriving at stadiums is becoming a problem, though, with Fifa revealing that it is turning away on average between 20 and 30 supporters with fake tickets each game.
Further afield, some 200 more Brazilians took part in a protest which resulted in violent clashes with police around 1.5 kilometres from the stadium itself and resulted in tear gas and stun grenades being employed to disperse the crowd.