Brazilian soldiers patrol Vila Pinhero favela --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

A Brazilian soldier stands guard in Vila Pinheiro--part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

A Brazilian soldier stands guard in Vila Pinheiro--part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol Vila Pinheiro --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol Vila Pinheiro --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

A Brazilian soldier checks a car during security operations in Vila Pinheiro --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol the street during security operations in Parque Uniao --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers stand guard during security operations in Parque Uniao --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol the street during security operations in Ramos--part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol the street during security operations in Parque Uniao --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol the street during security operations in Parque Uniao --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

Brazilian soldiers patrol the street during security operations in Parque Uniao --part of the Mare shantytown complex near the Galeao (Antonio Carlos Jobim) international airport-- in the north suburb of Rio de Janeiro on April 5, 2014. Thousands of soldiers --including some 2,000 paratroopers, 450 sailors and 200 military police-- in armored vehicles, trucks and on foot entered one of Rio de Janeiro's most notorious slums to provide security less than three months before the World Cup and until July 30. AFP PHOTO / CHRISTOPHE SIMON

A PM paramilitary police helicopter overflies the Favela da Mare shantytown complex, a drug-trafficking stronghold and considered one of the most dangerous places in the city, at down in Rio de Janeiro, Brazil, on March 30, 2014. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO/VANDERLEI ALMEIDA

A PM paramilitary police BOPE especial unit officer (in black) pops up from the rear hatch of a marine armoured car during a streel patrol along the Nueva Holanda favela, part of the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO/CHRISTOPHE SIMON

PM paramilitary police BOPE especial unit personnel and marines on APCs (armoured personnel carriers) patrol along a street of the Nueva Holanda favela, part of the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO/CHRISTOPHE SIMON

A PM paramilitary police helicopter overflies the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO / YASUYOSHI CHIBA

A PM paramilitary police helicopter overflies the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO / YASUYOSHI CHIBA

PM paramilitary police CORE elite unit personnel with an epower shovel patrol the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO / YASUYOSHI CHIBA

A PM paramilitary police helicopter overflies the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO/CHRISTOPHE SIMON

A PM paramilitary police helicopter overflies the Favela da Mare shantytown complex in Rio de Janeiro, Brazil, on March 30, 2014 early morning. More than 1,000 police backed by the military and armored vehicles occupied the vast Mare favela near Rio's international airport at dawn Sunday, just 74 days before the World Cup. AFP PHOTO/CHRISTOPHE SIMON