Activist Cornel West (L) is knocked over during a scuffle with police during a protest at the Ferguson Police Department in Ferguson, Missouri, in this October 13, 2014 file photo. (Photo by Jim Young/Reuters)

Brazil's President and Workers' Party (PT) presidential candidate Dilma Rousseff reacts during a news conference in Brasilia, in this October 13, 2014 file photo. (Photo by Ueslei Marcelino/Reuters)

A Palestinian man in clothes stained with the blood of his father, whom medics said was killed by Israeli shelling, mourns at a hospital in Khan Younis in the southern Gaza Strip, in this July 23, 2014 file photo. (Photo by Ibraheem Abu Mustafa/Reuters)

Actors are seen during the filming of the television series, the title of which is loosely translated as “State of Myths”, on set in Baghdad, in this October 10, 2014 file photo. (Photo by Thaier Al-Sudani/Reuters)

A visitor to the MIPIM property fair reacts as he is detained by police officers following scuffles with housing campaigners outside Olympia exhibition and conference centre in London, in this October 15, 2014 file photo. (Photo by Stefan Wermuth/Reuters)

Children sit in a pool among makeshift homes, part of the Nova Tuffy slum, in an abandoned factory compound in Rio de Janeiro, in this October 17, 2014 file photo. (Photo by Pilar Olivares/Reuters)

Smoke rises over the Syrian town of Kobani after an air strike, as seen from the Mursitpinar border crossing on the Turkish-Syrian border in the southeastern town of Suruc in Sanliurfa province, in this October 18, 2014 file photo. (Photo by Kai Pfaffenbach/Reuters)

Artist Pyotr Pavlensky sits on the wall enclosing the Serbsky State Scientific Center for Social and Forensic Psychiatry after he cut off a part of his earlobe during his protest action titled “Segregation” in Moscow, in this October 19, 2014 file photo. (Photo by Maxim Zmeyev/Reuters)

Japan's Justice Minister Midori Matsushima (C) reacts as she is surrounded by reporters upon her arrival at Prime Minister Shinzo Abe's official residence for a meeting with Abe in Tokyo, in this October 20, 2014 file photo. (Photo by Toru Hanai/Reuters)

Pro-democracy protesters watch formal talks between student protest leaders and government officials on a video screen near the government headquarters in Hong Kong, in this October 21, 2014 file photo. (Photo by Carlos Barria/Reuters)

A Christian pilgrim dips in the water at the baptismal site known as Qasr el-Yahud on the banks of the Jordan River, which also acts as a border line near the West Bank city of Jericho, in this October 22, 2014 file photo. (Photo by Baz Ratner/Reuters)

A golfer hits a tee shot as African migrants sit atop a border fence during an attempt to cross into Spanish territory, between Morocco and Spain's north African enclave of Melilla, in this October 22, 2014 file photo. (Photo by Jose Palazon/Reuters)

Three Islamic State fighters pray (bottom) as another runs to the top of a hill in the outskirts of Syrian town of Kobani, as seen from the Mursitpinar crossing on the Turkish-Syrian border in the southeastern town of Suruc, in Sanliurfa province, in this October 23, 2014 file photo. (Photo by Kai Pfaffenbach/Reuters)

A bus transporting members of an anti-North Korean civic group is surrounded by South Korean policemen near the demilitarised zone separating the two Koreas, in Paju, in this October 25, 2014 file photo. (Photo by Kim Hong-Ji/Reuters)

Protective suits are left to dry after an Ebola training session held by Spain's Red Cross in Madrid, in this October 29, 2014 file photo. (Photo by Susana Vera/Reuters)

A boy, covered with blood, reacts after sustaining injuries following what activists said was an air strike at a site by forces loyal to Syria's President Bashar al-Assad in Duma in eastern al-Ghouta, near Damascus, in this July 29, 2014 file photo. (Photo by Badra Mamet/Reuters)

A rebel fighter rests inside a room on the Karm al-Tarab frontline in Aleppo, in this July 30, 2014 file photo. (Photo by Hamid Khatib/Reuters)

Afghan Shi'ite Muslim men flagellate themselves during a Muharram procession in Kabul, in this October 31, 2014 file photo. (Photo by Omar Sobhani/Reuters)

A runner covers himself from the low temperatures and strong wind before the start of the New York City Marathon in New York, in this November 2, 2014 file photo. (Photo by Eduardo Munoz/Reuters)

Turkish soldiers keep warm atop a hill overlooking the Syrian town of Kobani, near the Mursitpinar border crossing on the Turkish-Syrian border, in the southeastern town of Suruc in Sanliurfa province, in this November 2, 2014 file photo. (Photo by Yannis Behrakis/Reuters)

Sheriffs' deputies look at wreckage from the crash of Virgin Galactic's SpaceShipTwo near Cantil, California, in this November 2, 2014 file photo. (Photo by David McNew/Reuters)

A worker uses a laptop inside his dormitory near a residential construction site in Hefei, Anhui province, in this August 6, 2014 file photo. (Photo by Reuters/Stringer)

Protesters hold a petrol bomb during clashes with pro-government forces at Independence Square in Kiev, in this August 7, 2014 file photo. (Photo by Konstantin Chernichkin/Reuters)

Palestinians rescue Mahmoud al-Ghol from under the rubble of a house in Rafah in the southern Gaza Strip, in this August 3, 2014 file photo. (Photo by Ibraheem Abu Mustafa/Reuters)

China's Shang Chunsong prepares to compete in the uneven bars event of the women's individual all-around final artistic gymnastics competition at the Namdong Gymnasium Club during the 17th Asian Games in Incheon, in this September 23, 2014 file photo. (Photo by Kim Hong-Ji/Reuters)