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Colleagues assist Reuters photographer Sergio Moraes, center, after being injured in the head with a rock during a protest against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup )

Demonstrators from the anarchist group Black Bloc clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil . (Photo by Victor Moriyama/Getty Images) ( 450492442 )

Demonstrators destroy a bus stop during a protest against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Fernando Vergara) ( Brazil Soccer WCup Protests )

Riot police fires rubber bullets to demonstrators during a protest against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup Protests )

People attempt to depart in the wake of a protest that became violent inside the Tataupe Metro station on June 12, 2014 in Sao Paulo, Brazil. This is the first day of the 2014 FIFA World Cup. (Photo by Mario Tama/Getty Images) ( 450501492 )

Riot police detain a homeless man who was protesting against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup Protests )

A policeman hits demonstrators with a shotgun during a protest against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup Protests )

A protester brakes the window of a bank during a demonstration against the 2014 World Cup in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup Protests )

Riot police arrest a protester (C) in Sao Paulo on June 12, 2014, at the beginning of the 2014 FIFA World Cup. AFP PHOTO / RODRIGO ARANGUA/AFP/Getty Images ( 530645176 )

Brazilian Black Bloc demonstrators empty a fire extinguisher during a protest against the World Cup at the Tatuape metro station in Sao Paulo, Brazil on June 12, 2014. AFP PHOTO/MIGUEL Schincariol/AFP/Getty Images ( 530644994 )

Demonstrators from the anarchist group Black Bloc clash with police during the protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil . Military police responded to the protest and there were reported injuries. (Photo by Victor Moriyama/Getty Images) ( 450491600 )

Police fire tear gas at protestors during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450490082 )

Demonstrators hold a banner that reads "Unfair players, FIFA police" in Belo Horizonte, Brazil, Thursday, June, 12, 2014. Demonstrators gathered in downtown Belo Horizonte to protest against the 2014 World Cup soccer tournament. (AP Photo/Bruno Magalhaes) ( Brazil Soccer WCup )

A demonstrator receives assistance after being injured during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530640962 )

Police frisk a man participating in a demonstration in Belo Horizonte, Brazil, Thursday, June, 12, 2014. Demonstrators gathered in downtown Belo Horizonte to protest against the 2014 World Cup soccer tournament. (AP Photo/Bruno Magalhaes) ( Brazil Soccer WCup )

Demonstrators gather during an anti-World Cup protest in Rio de Janeiro on June 12, 2014. Brazil was nervously gearing up for the start of the World Cup on Thursday with the host nation preparing to launch the month-long carnival as scattered protests broke out just hours from kick-off. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530640464 )

Riot policemen stand guard during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. Police fired tear gas, stun grenades and rubber bullets to break up dozens of protesters gathering near a Sao Paulo subway station with a red banner reading "If we have no rights, there won't be a Cup," saying they planned to march as close as possible to Corinthians Arena, the city's World Cup stadium. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530640507 )

Police take up positions during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450485142 )

A protestor bleeds from his forehead during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450491634 )

A demonstrator stands in front of police during a World Cup protest on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450487524 )

Posters of an anti- World Cup nature appear on a wall near the National Stadium ahead of the opening game of the 2014 FIFA World Cup on June 12, 2014 in Brasilia, Brazil. (Photo by Stu Forster/Getty Images) ( 450488728 )

Police fire non-lethal rounds at protestors during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450490502 )

Police fire non-lethal rounds at protestors during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450489182 )

Debris burns in the street during a World Cup protest outside Carrao Metro Station on June 12, 2014 in Sao Paulo, Brazil. (Photo by Mario Tama/Getty Images) ( 450491602 )

Demonstrators from the anarchist group Black Bloc clash with police during the protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450491612 )

An anti-World Cup demonstrator holds up her hands, wearing rubber gloves with the first two letters of the acronym, FIFA, during a protest demanding better public services and protesting the money spent on the World Cup soccer tournament, in downtown Rio de Janeiro, Brazil, Thursday, June 12, 2014, just hours before the opening match was to be played in Sao Paulo. (AP Photo/Silvia Izquierdo) ( Brazil Soccer WCup Protests )

Demonstrators clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492424 )

AP Photographer Rodrigo Abd receives aid after being injured during the protest against the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. Abd was allegedly shot by police who resonded to the protest. This is the first day of the 2014 FIFA World Cup. (Photo by Victor Moriyama/Getty Images) ( 450492244 )

Demonstrators from the anarchist group Black Bloc clash with police during the protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492468 )

Demonstrators from the anarchist group Black Bloc clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492738 )

Demonstrators from the anarchist group Black Bloc clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492810 )

Demonstrators from the anarchist group Black Bloc clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492832 )

A demonstrator festooned with glitter participates in a protest demanding better public services and protesting the money spent on the World Cup soccer tournament, in downtown Rio de Janeiro, Brazil, Thursday, June 12, 2014, just hours before the first World Cup match was to be played in Sao Paulo. (AP Photo/Silvia Izquierdo) ( Brazil Soccer WCup Protests )

People protest in front of police during an anti-World Cup demonstration on June 12, 2014 in Rio de Janeiro, Brazil. This is the first day of World Cup play. (Photo by Joe Raedle/Getty Images) ( 450496240 )

Demonstrators clash with police during a protest against the holding of the World Cup on the opening day of the event on June 12, 2014 in Sao Paulo, Brazil. (Photo by Victor Moriyama/Getty Images) ( 450492854 )

A masked man throws a stone towards riot policemen during a protest by people demanding better public services and against the money spent on the World Cup soccer tournament in Sao Paulo, Brazil, Thursday, June 12, 2014. (AP Photo/Rodrigo Abd) ( APTOPIX Brazil WCup Protests )

Two anti-World Cup demonstrators, one wearing a T-shirt with a message that reads in Portuguese; "Cup for whom?," and the other T-Shirt that reads; "FIFA terrorist," participate in a protest demanding better public services and protesting the money spent on the World Cup soccer tournament, in downtown Rio de Janeiro, Brazil, Thursday, June 12, 2014, just hours before the first World Cup match was to be played in Sao Paulo. (AP Photo/Silvia Izquierdo) ( Brazil Soccer WCup Protests )

Masked men work to uproot a street sign to add to a makeshift barricade during a protest by people demanding better public services and against the money spent on the World Cup soccer tournament in Sao Paulo, Brazil, Thursday, June 12, 2014. Brazilian police clashed with anti-World Cup protesters trying to block part of the main highway leading to the stadium that hosts the opening match of the tournament. (AP Photo/Rodrigo Abd) ( Brazil WCup Protests )

A demonstrator (R) wearing a gas mask stands next to a riot policeman during an anti-World Cup protest in Rio de Janeiro on June 12, 2014. Brazil was nervously gearing up for the start of the World Cup on Thursday with the host nation preparing to launch the month-long carnival as scattered protests broke out just hours from kick-off. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530636013 )

A demonstrator takes part in an anti-World Cup protest in Rio de Janeiro on June 12, 2014. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530636788 )

Demonstrators take part in an anti-World Cup protest in Rio de Janeiro on June 12, 2014. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530638149 )

Brazilian soldiers guard a road leading to Mineirao Stadium in Belo Horizonte, Brazil, Thursday, June, 12, 2014. (AP Photo/Victor R. Caivano) ( Brazil Soccer WCup )

An anti-World Cup demonstrator, wearing a unicorn mask, attends a protest demanding better public services and protesting the money spent on the World Cup soccer tournament, in downtown Rio de Janeiro, Brazil, Thursday, June 12, 2014, just hours before the first World Cup match was to be played in Sao Paulo. (AP Photo/Silvia Izquierdo) ( Brazil Soccer WCup Protests )

Demonstrators take part in an anti-World Cup protest in Rio de Janeiro on June 12, 2014. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530638242 )

Demonstrators gather during an anti-World Cup protest in Rio de Janeiro on June 12, 2014. AFP PHOTO / YASUYOSHI CHIBA/AFP/Getty Images ( 530638542 )

A riot policeman stops a passer-by during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. Police fired tear gas, stun grenades and rubber bullets to break up dozens of protesters gathering near a Sao Paulo subway station with a red banner reading "If we have no rights, there won't be a Cup," saying they planned to march as close as possible to Corinthians Arena, the city's World Cup stadium. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530636223 )

A demonstrator receives assistance after being injured during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530637742 )

Riot policemen stand guard during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530640510 )

Riot policemen are deployed during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530640857 )

A demonstrator kicks a tear gas grenade during an anti-World Cup protest, on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530641272 )

Tear gas grenades explode among cars during an anti-World Cup protest, on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530641309 )

Riot police are deployed during an anti-World Cup protest, on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530641313 )

Riot policemen fire tear gas and rubber bullets during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / LAURENT THOMET/AFP/Getty Images ( 530640457 )

Riot policemen move by a fire set up by demonstrators during an anti-World Cup protest on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530640461 )

Demonstrators block a street during an anti-World Cup protest, on the morning the Brazilian mega-city hosts the tournament's opening match, in Sao Paulo on June 12, 2014. AFP PHOTO / Miguel Schincariol/AFP/Getty Images ( 530641378 )