Demonstrations turn violent in Brazil

Firefighters throws water onto a barricade set alight near the Cinelandia square after a march in support of teachers on strike in Rio de Janeiro, Brazil.

A demonstrator from the group called Black Bloc runs outside the Municipal Assembly during a protest supporting a teachers' strike in Rio de Janeiro.

A bus burns after demonstrators from the group Black Bloc set fire to it during a protest in Rio de Janeiro.

Masked demonstrators burn trash outside the City Hall, following a peaceful teachers protest demanding better working conditions and against police beating.

A demonstrator from the group called Black Bloc throws a stone as he clashes with riot police outside of the Municipal Assembly during a protest supporting a teachers' strike in Rio de Janeiro.

People pack the Cinelandia square during a march in support of teachers on strike in Rio de Janeiro, Brazil.

A riot policeman carries a chair while clearing the streets during a protest in Rio de Janeiro.

A demonstrator from the group called Black Bloc kicks a tear gas bomb as he clashes with riot police outside the Municipal Assembly during a protest supporting a teachers' strike in Rio de Janeiro.

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.

A man walks past a burning bus after demonstrators from the group Black Bloc set fire to it during a protest in Rio de Janeiro.

A demonstrator clashes with riot police during a protest supporting a teachers' strike outside of the Municipal Assembly in Rio de Janeiro.

A man holds a sign that reads in Portuguese 'Mexico is here' referred to a similar teacher's strike in Mexico during a demonstrator in support of Brazilian teachers on strik in Rio de Janeiro, Brazil.

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.

A demonstrator from a group called Black Bloc throws a piece of a wood as they try to invade the Municipal Assembly during a protest supporting a teachers' strike in Rio de Janeiro.

Demonstrators with their faces covered try to invade the City Council after a march in support of teachers on strike in Rio de Janeiro, Brazil.

An indigenous man wears a mask during a march in support of teachers on strike in Rio de Janeiro, Brazil.

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.

Demonstrators with their faces covered take cover from tear gas fired by riot police outside the City Council after a march in support of teachers on strike in Rio de Janeiro, Brazil.

A demonstrator with his face covered hold as shield during a march in support of teachers on strike in Rio de Janeiro, Brazil.

An indigenous man sings in front of a burning barricade in support of teachers on strike during a demonstration in Rio de Janeiro, Brazil