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A demonstrator with his face covered hold as shield during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

Protesters stand during a mostly peaceful demonstration by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. The last few weeks have seen a citywide strike by union education workers in Rio and police used tear gas to disperse a group of around 100 protesting teachers last week. (Photo by Mario Tama/Getty Images) ( 183603035 )

An indigenous man wears a mask during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

Demonstrators with their faces covered take cover behind a sign that reads "Memorias Postumas, Machado de Assis" or "The Posthumous Memoirs-Machado de Assis," near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

General view of a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. ANDERLEI ALMEIDA/AFP/Getty Images ( 523595411 )

A girl bears a sticker in her mouth reading "Education on strike" during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. YASUYOSHI CHIBA/AFP/Getty Images ( 523596587 )

Brazilian policemen take position near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

A Brazilian native and demonstrators in fancy dress shout slogans during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. CHRISTOPHE SIMON/AFP/Getty Images ( 523594549 )

Demonstrators with their faces covered break ATM machines inside a bank after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

A woman covers from tear gas fired by police near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

Masked protesters set a bus on fire near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

Protesters kick in wood panels blocking a bank location after tear gas was fired by the police to disperse protesters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. (Photo by Mario Tama/Getty Images) ( 183596540 )

Brazilian policemen take position near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

A demonstrator wears gas mask over a batman costume during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

An incendiary device is fired toward a government building during a mostly peaceful protest by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. (Photo by Mario Tama/Getty Images) ( 183600453 )

Protesters hug during a mostly peaceful demonstration by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. (Photo by Mario Tama/Getty Images) ( 183600460 )

A protester is assisted after being overcome by tear gas fired by the police to disperse protesters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. (Photo by Mario Tama/Getty Images) ( 183603485 )

Masked demonstrators burn trash outside the City Hall, following a peaceful teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro, Brazil. YASUYOSHI CHIBA/AFP/Getty Images ( 523596761 )

An elderly couple walks during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. YASUYOSHI CHIBA/AFP/Getty Images ( 523597079 )

Masked demonstrators throw molotov cocktails at the Palacio Tiradentes, the seat of Rio de Janeiro's Legislative Assembly, following a peaceful teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. CHRISTOPHE SIMON/AFP/Getty Images ( 523595935 )

Demonstrators with their faces covered take cover from tear gas fired by riot police outside the City Council during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

Protesters disperse after tear gas was fired by the police to clear protesters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. Photo by Mario Tama/Getty Images) ( 183596541 )

Demonstrators march during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. CHRISTOPHE SIMON/AFP/Getty Images ( 523594732 )

A man cooks popcorn as protesters gather in front of a government building during a mostly peaceful protest by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. (Photo by Mario Tama/Getty Images) ( 183603069 )

A demonstrator with his face covered stands next a burning barricade near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

Demonstrators march during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. CHRISTOPHE SIMON/AFP/Getty Images ( 523594576 )

Riot police officers move toward a bus set on fire by demonstrators near the Cinelandia square during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Felipe Dana) ( Brazil Teachers Protest )

An elderly couple walks during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. YASUYOSHI CHIBA/AFP/Getty Images ( 523596603 )

Demonstrators with their faces covered stand outside the City Council during a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months.(AP Photo/Silvia Izquierdo) ( Brazil Teachers Strike )

Demonstrators hold signs during a teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. YASUYOSHI CHIBA/AFP/Getty Images ( 523596632 )

Protesters stand during a mostly peaceful demonstration by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. The last few weeks have seen a citywide strike by union education workers in Rio and police used tear gas to disperse a group of around 100 protesting teachers last week. (Photo by Mario Tama/Getty Images) ( 183603049 )

Protesters wave flags near a small fire in front of police during a mostly peaceful protest by teachers and supporters calling for better public education and services on October 7, 2013 in Rio de Janeiro, Brazil. While the majority of protesters were peaceful, a small group fired incendiary devices and the police eventually dispersed the crowd with tear gas. (Photo by Mario Tama/Getty Images) ( 183603021 )

Demonstrators with their faces covered thow stones at riot police near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil, Monday, Oct. 7, 2013. Teachers have been on strike demanding better pay for almost two months. (AP Photo/Silvia Izquierdo) ( Brazil Teachers Protest )

A group of masked demonstrators attack cash dispensers, following a peaceful teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro. CHRISTOPHE SIMON/AFP/Getty Images ( 523596110 )

Masked demonstrators try to destroy a gate of the City Hall following a peaceful teachers protest demanding better working conditions and against police beating, on October 7, 2013 in Rio de Janeiro, Brazil. YASUYOSHI CHIBA/AFP/Getty Images ( 523596537 )