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A protestor faces a line of riot police during an anti-government protest in Budapest October 23, 2006. Police fired rubber bullets to try to disperse anti-government protesters marching towards parliament on the 50th anniversary of Hungary's uprising against Soviet rule, a witnesses said. REUTERS/Laszlo Balogh ( HUNGARY )

A Colombian demonstrator clashes with anti-riot police after the arrival of U.S. President George W. Bush in Bogota, Colombia, March 11, 2007. REUTERS/Daniel Munoz ( BUSH-LATINAMERICA/COLOMBIA )

An indigenous woman holds her child while trying to resist the advance of Amazonas state policemen who were expelling the woman and some 200 other members of the Landless Movement from a privately-owned tract of land on the outskirts of Manaus, in the heart of the Brazilian Amazon March 11, 2008. The landless peasants tried in vain to resist the eviction with bows and arrows against police using tear gas and trained dogs. REUTERS/Luiz Vasconcelos-A Critica/AE ( BRAZIL/ )

A protester urinates in front of a row of policemen during riots following the death of a 15-year-old boy in San Carlos de Bariloche June 18, 2010. According to local media, provincial government officials have confirmed that four police officers, involved in the incident which left the boy dead during an alleged robbery, have been removed from their posts. Three people died and at least 12 were injured during the clashes. REUTERS/Alejandra Bartoliche ( ARGENTINA/ )

A demonstrator blocks a riot police vehicle spraying protesters with a water cannon during May Day rallies in Santiago May 1, 2008. REUTERS/Ivan Alvarado ( CHILE-MAYDAY/ )

A protester throws a stone at police in front of the Greek Parliament building during clashes in Athens, December 12, 2008. Greek students hurled firebombs and stones at police outside parliament in violence over the police killing of a teenager that has threatened Greece's government. REUTERS/John Kolesidis ( GREECE-UNREST/ )

A supporter of striking workers at Ssangyong Motor scuffles against policemen as the police block a protest in front of the automaker's main plant in Pyeongtaek, about 70 km (40 miles) south of Seoul, June 27, 2009. REUTERS/Lee Jae-Won ( KOREA/ )

A local woman on a crutch shouts at Chinese paramilitary police wearing riot gear as a crowd of angry locals confront security forces on a street in the city of Urumqi in China's Xinjiang Autonomous Region July 7, 2009.REUTERS/David Gray ( CHINA-XINJIANG/ )

A demonstrator hurls projectiles at riot police near the Greek parliament in Athens during a nationwide strike in Greece, May 5, 2010. Greece braced for a day of demonstrations during a nationwide strike by civil servants protesting the announcement of draconian austerity measures. REUTERS/John Kolesidis ( GREECE )

A demonstrator shows his bottom to riot police during a protest by European workers and trade union representatives to demand better job protection in the European Union countries in Brussels March 24, 2011. REUTERS/Thierry Roge ( EU-SUMMIT/ )

A pro-democracy demonstrator gestures at policemen during a protest organized by the "February 20 Movement", who are demanding political reforms, in Casablanca May 29, 2011. REUTERS/Macao ( MOROCCO-PROTEST/ )

A protester shouts at police guarding outside the Greek parliament in Athens June 15, 2011. Greek police fired tear gas at demonstrators as tens of thousands of grassroots activists and unionists vowed to converge on Athens' central Syntagma (Constitution) Square as Prime Minister George Papandreou prepared to push through a new five-year campaign of tax hikes, spending cuts and selloffs of state property to continue receiving aid from the European Union and International Monetary Fund and avoid default. REUTERS/Yannis Behrakis ( GREECE/ )

A protester takes cover during clashes with riot police in front of the Interior Ministry in Cairo June 29, 2011. Police in central Cairo fired tear gas at hundreds of mainly young stone-throwing Egyptians demanding that trials of former senior officials from the discredited Mubarak era proceed faster. Clashes broke out in an area of the capital where some families of the more than 840 people killed in the uprising that led to President Hosni Mubarak's overthrow held an event to honor those dead. REUTERS/Mohamed Abd El-Ghany ( EGYPT/PROTEST )

Nationalist youths and police in riot gear clash in the Ardoyne area of north Belfast July 12, 2011. REUTERS/Cathal McNaughton ( IRISH-RIOTS/ )

A protester confronts riot police guarding the entrance to Thessaloniki's International Trade Fair during a protest against austerity September 10, 2011. REUTERS/Yannis Behrakis ( GREECE-ECONOMY/ )

Riot police scuffle with residents of Boeung Kak lake during a protest in front of the City Hall in Phnom Penh November 28, 2011. Thousands of families living near the lake are facing eviction to make way for a Chinese development project. REUTERS/Samrang Pring ( CAMBODIA/ )

A student protester stands on one side of a barricade formed with chairs in front of riot police vehicles during an anti-government demonstration demanding changes in the public state education system in Santiago August 28, 2012. REUTERS/Ivan Alvarado ( CHILE/ )

A naked protester runs past the parliament in Syntagma Square in Athens during a violent protest against the visit of Germany's Chancellor Angela Merkel October 9, 2012. REUTERS/John Kolesidis ( GREECE-MERKEL/ )

An anti-government protester pushes riot police officers during scuffles near the Government house in Bangkok November 24, 2012. Thai police fired tear gas to disperse hundreds of anti-government protesters who pushed through barriers and clashed with security forces as thousands gathered seeking to overthrow Prime Minister Yingluck Shinawatra's government. REUTERS/Damir Sagolj ( THAILAND-PROTEST/ )

A protester gestures during clashes with riot police along a road which leads to the U.S. embassy, near Tahrir Square in Cairo, November 28, 2012. REUTERS/Amr Abdallah Dalsh ( EGYPT/ )

An anti-Mursi protester chants slogans on a newly built barrier in front of soldiers guarding outside the Egyptian presidential palace in Cairo December 9, 2012. REUTERS/Asmaa Waguih ( EGYPT-POLITICS/ )

An anti-Mursi protester gestures to soldiers marching outside the Egyptian presidential palace in Cairo December 9, 2012. REUTERS/Asmaa Waguih ( EGYPT-POLITICS/ )

Activists of Jamaat-e-Islami shout slogans during a clash with police in Dhaka March 11, 2013. Around 50 people have been arrested as police raided the office of the Bangladesh Nationalist Party (BNP) following a violent clash with activists of the BNP and its ally Jamaat-e-Islami after a scheduled rally, local media reported. REUTERS/Andrew Biraj ( BANGLADESH/ )

A Buddhist nun holding a Taiwanese flag confronts riot police outside the Nationalist Party headquarters in Taipei March 20, 2000. Hundreds of protesters demanded the resignation of party chairman Lee Teng-hui after presidential elections ended more than five decades of Nationalist rule. Bobby Yip / Reuters ( YEAREND )

An opposition supporter gestures in front of riot police guarding the presidential palace in Taipei March 21, 2004. Opposition supporters gather to protest the outcome of Taiwan's elections in front of the presidential palace in Taipei March 21, 2004. Protests erupted in several major cities as Lien supporters demanded an immediate recount after incumbent President Chen Shui-bian's narrow victory in the closest such election in Taiwan's history. REUTERS/Thomas White ( TAIWAN ELECTION )

A Beijing citizen stands in front of tanks on the Avenue of Eternal Peace on June 5, 1989 during the crushing of the Tiananmen Square uprising. REUTERS/Arthur Tsang ( CHINA TIANANMEN )

A protester kicks a tear gas canister back at policemen during a during a mass rally in Athens December 12, 2007. Striking workers brought Greece to a standstill and tens of thousands marched through the streets of Athens to protest against the government's pension reform plans. REUTERS/Yiorgos Karahalis ( GREECE-STRIKE/ )

A student protester clashes with the police during a rally against the government's plans to increase fuel prices, in front of the presidential palace in Jakarta May 21, 2008. Indonesia's president asked for calm as thousands staged a rally to protest a plan to lift fuel subsidy and demand for more democratic reform. REUTERS/Dadang Tri ( INDONESIA-PROTEST/ )

A lone protester faces a line of riot police during skirmishes in central Edinburgh July 4, 2005. Riot police used mounted and baton charges to quell disturbance and contain protestors who are in the city to protest during the G8 summit in Gleneagles. Jeff J Mitchell UK / Reuters ( BRITAIN )

A protester throws stones at riot police during clashes in central Athens December 7, 2009. Greek police fired teargas at hundreds of stone-throwing youths protests to mark the one-year anniversary of the police killing of a teenager. REUTERS/Yiorgos Karahalis ( GREECE-PROTEST/ )

A student of the Buenos Aires University Union Federation (FUBA) kicks a barrier in front of the Congress in Buenos Aires, December 14, 2009, amid clashes with riot police during a protest staged to avoid an assembly to elect the new rector of the university. REUTERS/Joaquin Salguero ( ARGENTINA/ )