A demonstrator, depicting a member of the extinct indigenous tribe Selknam, poses in front of riot police vehicles during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





Demonstrators clash with riot policemen during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





Demonstrators hit a riot policeman during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





Demonstrators clash with riot policemen during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





A riot policeman attempts to detain a demonstrator during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator is detained by a riot policeman during a protest march by Mapuche Indian activists against Columbus Day in downtown Santiago, Chile October 10, 2016. (Photo by Ivan Alvarado/Reuters)





Taxi drivers face off with a policeman during a protest against Uber Technologies Inc. in Lisbon, Portugal, October 10, 2016. (Photo by Pedro Nunes/Reuters)





Taxi drivers protest against Uber Technologies Inc. in Lisbon, Portugal, October 10, 2016. (Photo by Pedro Nunes/Reuters)





A student gestures near a burning bus during clashes with riot police following a protest over University tuition fees on October 10, 2016 in Johannesburg. South African student protesters and police clashed in renewed violence in Johannesburg as attempts to re-open Wits University descended into running battles on campus. Protesters throwing rocks were dispersed by riot police using tear gas, rubber bullets and stun grenades as pressure ratchets up on campuses across the country over tuition fees. (Photo by Mujahid Safodien/AFP Photo)





A riot police officer and private security guards attempt to detain a student as they clashed during protests with students demanding free education on Monday at the Johannesburg's University of the Witwatersrand, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





Demonstrators run away from a police Nyala vehicle during student protests demanding free education at the Johannesburg's University of the Witwatersrand, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





A demonstrator hurls rocks at shield-wielding private security guards during student protests demanding free education at the Johannesburg's University of the Witwatersrand, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





Students demanding free education chant slogans in front of burning barricade outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10, 2016. (Photo by Siphiwe Sibeko/Reuters)





A riot police officer runs past burning barricade during clashes with students demanding free education outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10, 2016. (Photo by Siphiwe Sibeko/Reuters)





A pedestrian crosses a street during protests by students demanding free education on Monday outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





A student demanding free education is detained by riot police officers outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





Students demanding free education react as they are fired at by riot police officers during a protest outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10,2016. (Photo by Siphiwe Sibeko/Reuters)





A student demanding free education is seen in a police armoured vehicle after being detained during protests outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10, 2016. (Photo by Siphiwe Sibeko/Reuters)





Restaurant workers watch from a window as student demanding free education protest outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10, 2016. (Photo by Siphiwe Sibeko/Reuters)





A student demanding free education is detained during protests outside the University of the Witwatersrand at Braamfontein, in Johannesburg, South Africa, October 10, 2016. (Photo by Siphiwe Sibeko/Reuters)





A protesting student runs past a burning bus off campus outside the University of the Witwatersrand in Johannesburg, South Africa on Monday, October 10, 2016. Tear gas and water cannon were fired as hundreds of students protested at the university amid a bitter national dispute with university managers and the government over demonstrators' demands for free education, forcing student into the neighbouring city streets. (Photo by AP Photo)





Protesters run and hide as police fire rubber bullets after the FeesMustFall protest spills onto the streets in Braamfontein district, in Johannesburg, on October 10, 2016. University tuition fees have become a flashpoint for protests in South Africa, which has struggled to provide education, jobs and housing for many poor black people since the end of apartheid in 1994. Violent clashes with police have erupted regularly on campuses across the country in recent months, and several universities have been closed to avoid further unrest. (Photo by John Wessels/AFP Photo)





A policeman clashes with a student on the University of the Witwatersrand campus in Johannesburg, South Africa, on Monday, October 10, 2016. Tear gas and water cannon were fired as hundreds of students protested at the university amid a bitter national dispute with university managers and the government over demonstrators' demands for free education. (Photo by Yeshiel Panchia/AP Photo)





A student hurls a stone off the University of the Witwatersrand campus in Johannesburg South Africa on Monday, October 10, 2016. Tear gas and water cannon were fired as hundreds of students protested at the university amid a bitter national dispute with university managers and the government over demonstrators' demands for free education. (Photo by AP Photo)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police stop women holding carnations as they march to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





A demonstrator tries to stop riot police as they clash with a crowd gathering to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police take cover behind shields as they clash with a crowd gathering to A demonstrator tries to stop riot police as they clash with a crowd gathering to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police clash with demonstrators who gathered to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)





Riot police argue with a demonstartor as they disperse a crowd gathering to commemorate last year's deadly suicide bombing near the main train station in Ankara, Turkey, October 10, 2016. (Photo by Umit Bektas/Reuters)