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Protesters show bullet casings during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi on Tuesday

Goran Tomasevic/Reuters

Protesters show bullet casings during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi on Tuesday

Jennifer Huxta/AFP

Protestors raise their hands during a demonstration in the Musaga neighbourhood of Bujumbura on Monday

Protesters carry a dead crow as they chant anti-government slogans during demonstrations against the ruling CNDD-FDD party's decision to allow President Pierre Nkurunziza to run for a third five-year term in office, in Bujumbura, Burundi on Thursday. A senior U.S. diplomat told Burundi's President, Pierre Nkurunziza, on Thursday that the east African country risks boiling over if it stifles political opposition, as protests against the president entered a fifth day. Tom Malinowski, U.S. assistant secretary of state for democracy, human rights and labor, arrived in Burundi on Wednesday to try to help halt escalating unrest and defuse the country's biggest crisis in years, set off by Nkurunziza's decision to seek a third term in office

Thomas Mukoya/Reuters

Protesters carry a dead crow as they chant anti-government slogans during demonstrations against the ruling CNDD-FDD party’s decision to allow President Pierre Nkurunziza to run for a third five-year term in office, in Bujumbura, Burundi on Thursday

Protesters demonstrate ahead of a 10 p.m. curfew Wednesday, April 29, 2015, in Baltimore. The curfew was imposed after unrest in Baltimore over the death of Freddie Gray while in police custody. (AP Photo/Matt Rourke)

Matt Rourke/AP

Protesters demonstrate ahead of a 10pm curfew in Baltimore, Maryland. The curfew was imposed after unrest in Baltimore over the death of Freddie Gray while in police custody 

Demonstrators Gather Outside Baltimore Police Station to Protest Death of Freddie Gray...epa04723487 A young girl peers into a destroyed Baltimore City Police car along North Avenue near a CVS that was on fire during a protest for the death of Freddie Gray in Baltimore, Maryland, USA, 27 April 2015. Gray died of spinal cord injuries on 19 April while in police custody; the US Justice Department announced that they are launching their own investigation into the case.  EPA/NOAH SCIALOM

Noah Scialom/EPA

A young girl peers into a destroyed Baltimore City Police car along North Avenue near a CVS that was on fire during a protest for the death of Freddie Gray in Baltimore, Maryland

A disabled protester sits on the road during clashes with riot police against the decision made by Burundi's ruling National Council for the Defence of Democracy-Forces for the Defence of Democracy (CNDD-FDD) party to allow President Pierre Nkurunziza to run for a third five-year term in office, in the capital Bujumbura, April 27, 2015. Burundi police fired tear gas and water cannon at protesters on Monday in the second day of demonstrations against Nkurunziza's bid for a third term in office, a Reuters witness said.

Thomas Mukoya/Reuters

A disabled protester sits on the road during clashes with riot police against the decision made by Burundi’s ruling National Council for the Defence of Democracy-Forces for the Defence of Democracy (CNDD-FDD) party to allow President Pierre Nkurunziza to run for a third five-year term in office, in the capital Bujumbura, on Monday

An Ultra-Orthodox Jewish Rabbis wear burlap sacks as a sign of mourning and blowing the Shofar  during a demonstration Prayer in Beit Shemesh, Israel, 16 April 2015. Hundreds of Ultra-Orthodox Jews protested against the construction of new housing units, believing they would be built at the site of ancient Jewish graves.

Abir Sultan/EPA

An Ultra-Orthodox Jewish Rabbis wear burlap sacks as a sign of mourning and blowing the Shofar during a demonstration Prayer in Beit Shemesh, Israel on Thursday. Hundreds of Ultra-Orthodox Jews protested against the construction of new housing units, believing they would be built at the site of ancient Jewish graves

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa...Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa March 13, 2015.

Khaled Abdullah/Reuters

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen’s former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa on Friday

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, raise their rifles as they demonstrate in Sanaa, March 10, 2015. The supporters were demanding for presidential elections to be held and for Ahmed Ali Abdullah Saleh to run for presidency.

Khaled Abdullah/Reuters

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen’s former President Ali Abdullah Saleh, raise their rifles as they demonstrate in Sanaa on Tuesday. The supporters were demanding for presidential elections to be held and for Ahmed Ali Abdullah Saleh to run for presidency

Myanmar student protesters and nationalists clash with riot police during a march in Letpadan town, some 130 kilometres (80 miles) north of Myanmar's main city on March 10, 2015. Student protesters have embarked on months of demonstrations calling for education reform, but plans by a core group to march to Yangon have been halted by police in the dusty central town of Letpadan, who have surrounded around 150 activists since March 2.

Soe Than Win/AFP

Myanmar student protesters and nationalists clash with riot police during a march in Letpadan town, some 130km (80 miles) north of Myanmar’s main city on Tuesday. Student protesters have embarked on months of demonstrations calling for education reform, but plans by a core group to march to Yangon have been halted by police in the dusty central town of Letpadan

Anti-fracking protestors demonstrate outside County Hall Preston, north west Engalnd, 28 January 2015.  Lancashire County Council are deciding on two planning applications that will set a precedent for fracking plans in England. The decision has been deferred for eight weeks after a a request from energy firm Cuadrilla.

Peter Powell/EPA

Anti-fracking protestors demonstrate outside County Hall Preston, north west England on Wednesday. Lancashire County Council are deciding on two planning applications that will set a precedent for fracking plans in England. The decision has been deferred for eight weeks after a a request from energy firm Cuadrilla

An Afghan man kicks a poster of Pakistani religious leader Maulana Fazlur Rehman during a demonstration against his visit in Kabul, January 8, 2015.

Omar Sobhani

An Afghan man kicks a poster of Pakistani religious leader Maulana Fazlur Rehman during a demonstration against his visit in Kabul on Thursday

Italian Police prepare to face up to demonstrators in Rome, Italy on Wednesday during a  a demonstration in Rome against the government's Jobs Act labour reform bill. Three protesters were injured in a police charge at the demonstration. The protest organized by the self-styled National Social Strike Laboratory said high school students occupying their schools this week also participated in the march through central Rome, which turned into a melee when protesters tried to break through a police cordon around the Senate building, setting off flares and throwing eggs at law enforcement. The government's Jobs Act labour reform bill now on the floor of the Senate, where the administration of Premier Matteo Renzi looks set to call a confidence vote.

Massimo Percossi/EPA

Italian Police prepare to face up to demonstrators in Rome, Italy on Wednesday during a a demonstration in Rome against the government’s Jobs Act labour reform bill

A man carries placards that read "Free education. Tax the rich" in preparation for a student march against university fees in London on November 19, 2014. The demonstration organised by the Student Assembly Against Austerity, alongside the Young Greens and National Campaign Against Fees and Cuts demands free education and an end to tuition fees, education cuts and student debt.

Justin Tallis/AFP

A man carries placards that read ‘Free education. Tax the rich’ in preparation for a student march against university fees in London on Wednesday

Demonstators hold flares during a demonstration as part of a general strike in central Rome on November 14, 2014.

Filippo Monteforte/AFP

Demonstators hold flares during a demonstration as part of a general strike in central Rome on Friday

A volunteer marshall sits at a first aid encampment set up by pro-democracy protesters at a protest site in the Causeway Bay district of Hong Kong on November 14, 2014. More than a month after tens of thousands of Hong Kongers took to the streets demanding free leadership elections for the semi-autonomous Chinese city, weary demonstrators remain encamped across several major roads.

Philippe Lopez/AFP

A volunteer marshall at a first-aid post at an encampment set up by pro-democracy protesters in the Causeway Bay district of Hong Kong on Friday.

A man, who attempted to attack Hong Kong media magnate Jimmy Lai, is held on the ground with his limbs tied by pro-democracy protesters in an occupied area in Hong Kong...A man, who attempted to attack Hong Kong media magnate Jimmy Lai, is held on the ground with his limbs tied by pro-democracy protesters in an occupied area in Hong Kong November 12, 2014. Three men were restrained by pro-democracy protesters after they tried to attack Lai, an outspoken critic of Beijing who has supported pro-democracy activists through his publications and with donations, at the protest site. Pro-democracy protesters used plastic cords to bind the men as they waited for police to arrive at the scene.   REUTERS/Tyrone Siu (CHINA - Tags: POLITICS CIVIL UNREST)

Tyrone Siu/Reuters

A man, who attempted to attack Hong Kong media magnate Jimmy Lai, is held on the ground with his limbs tied by pro-democracy protesters in an occupied area in Hong Kong. Three men were restrained by pro-democracy protesters after they tried to attack Lai, an outspoken critic of Beijing who has supported pro-democracy activists through his publications and with donations, at the protest site. Pro-democracy protesters used plastic cords to bind the men as they waited for police to arrive at the scene. 

Demonstrators protest in the Brisbane CBD over climate change, uranium mining, coal seam gas fracking and traditional land rights ahead of the 2014 G20 Leaders Summit on November 11, 2014 in Brisbane, Australia. International leaders will descend on Brisbane for the annual G20 summit November 15-16.

Glenn Hunt/Getty Images

Demonstrators protest in the Brisbane CBD over climate change, uranium mining, coal seam gas fracking and traditional land rights ahead of the Group of 20 leaders’ summit, which starts on Saturday

 A Yemeni woman wears buttons depicting Yemen's ex-president Ali Abdullah Saleh during a gathering to protest against foreign interferences, in Sana'a, Yemen, 07 November 2014. Reports state thousands of supporters of former Yemeni president Ali Abdullah Saleh gathered in center Sana'a to protest against a US-backed move of the UN Security Council to impose a travel ban and assets freeze on Saleh due to his involvement in obstructing the country s transitional process. Recently, he has been accused of colluding with Shiite Houthi fighters in their military takeover of much of Yemen.

Yahya Arhab/EPA

A Yemeni woman wears buttons depicting Yemen’s ex-president Ali Abdullah Saleh during a gathering to protest against foreign interferences, in Sanaa, Yemen

Clashes break out between police and demonstrators as thousands of people take part in a demonstration on the streets in Brussels, Belgium, 06 November 2014. About 100,000 protesters are expected ta take part to the demonstration. The call of trade union front (FGTB-CSC-CGSLB) to participate in the national demonstration against the economic measures announced by the federal government.

Julian Warnand/EPA

Clashes break out between police and demonstrators as thousands of people take part in a demonstration on the streets in Brussels, Belgium. About 100,000 protesters took part in the demonstration