Organisers and police have promised to step up security within and around 12 World Cup stadiums in the wake of several incidents in the opening week of the competition.

At the Maracanã in Rio de Janeiro, Argentina fans breached the security cordon before their match with Bosnia and then on Wednesday Chile fans rampaged through the media centre having forced their way into the ground.

The 85 fans, who were detained by military police after destroying partition walls in the media centre, were later given 72 hours to leave the country.

While every ground has an exclusion zone around it, into which non-ticket holders are not permitted access, concern over copycat incidents involving ticketless fans has prompted a rethink. Following a summit meeting between the ministries of justice, sport, defence, Fifa and the local organising committee on Friday, plans were announced to step up security.

The physical fencing around stadiums will be reinforced and the number of security staff increased at the checkpoints that surround the 12 grounds and within the stadiums themselves.

At the Maracanã, the Rio military police said that they plan to introduce an extra layer of security and increase the number of officers on duty around the stadium by 600 to 3,100.

“We are going to establish an extra isolation cordon with mobile fences in the Maracanã’s sensitive zones and mobilise 600 police in those zones,” the Rio military police commander José Luis Castro told a press conference.