In this Monday, February 20, 2012 file photo, Kenyan army soldiers ride on a vehicle at their base in Tabda, inside Somalia. Heavily armed fighters from the Islamic extremist group al-Shabab attacked a base for African Union peacekeepers in southwestern Somalia on Friday, January 15, 2016, blasting their way into the compound and exchanging fire with peacekeepers, a Somali military official said. (Photo by Ben Curtis/AP Photo)





In this undated photo provided by researchers on January 12, 2016, volunteer Sergey Gorbunov works at the excavation site of a mammoth carcass in northern Russia's Siberia region near the Kara Sea. The remains from about 45,000 years ago have revealed the earliest known sign of humans in the Arctic. Marks on the bones indicate the creature was stabbed and butchered. The tip of a tusk was damaged in a way that suggests human activity, perhaps to make ivory tools. (Photo by Alexei Tikhonov/Pitulko et al./Science via AP Photo)





A view of the Ohrid lake near Struga, The Former Yugoslav Republic of Macedonia, Thursday January 14, 2016. Europe's oldest lake is under threat from Mediterranean style-resorts and man-made sandy beaches, marine biologists have warned. Lake Ohrid is a Unesco Word Heritage Site and home to 350 species found nowhere else in the world. (Photo by Georgi Licovski/EPA)





Cast member and executive producer Eva Longoria smiles at a panel for the NBC series "Telenovela" during the Television Critics Association (TCA) Cable Winter Press Tour in Pasadena, California, January 13, 2016. (Photo by Mario Anzuoni/Reuters)





Fireworks explode over the St. Sava temple (L) and the Karadjordje's monument during the Orthodox Christian New Year's Day celebrations in Belgrade January 14, 2016. Serbian Orthodox believers celebrate New Year on January 14. (Photo by Marko Djurica/Reuters)





A woman carries her daughter as she sells candies at the Constitution Square in downtown Guatemala City, Guatemala, January 13, 2016 prior to the inauguration of Guatemala's President-elect Jimmy Morales. (Photo by Jose Cabezas/Reuters)





Serena Williams (R) of the U.S. sits on her racquet as she talks to her coach Patrick Mouratoglou during a practice session at Melbourne Park, Australia, January 14, 2016. The Australian Open tennis tournament starts January 18. (Photo by David Gray/Reuters)





Buddhist monks chat outside their residence in a monastery in Bangkok, Thailand, January 14, 2016. Political divisions and allegations of corruption are fueling an unholy battle for the leadership of Thai Buddhism, reigniting calls for reforms of the country's dominant religion. The top nominee for the post of Supreme Patriarch is a 90-year-old abbot currently being investigated for a tax scam involving luxury cars. (Photo by Jorge Silva/Reuters)





Tate employees pose for photographers with of Phyllida Barlow's "untitled: upturnedhouse:" sculpture at Tate Modern in central London, Britain January 14, 2016. (Photo by Stefan Wermuth/Reuters)





A tourist from Germany cries as she visits the site of Tuesday's suicide bomb attack at Sultanahmet square in Istanbul, Turkey January 14, 2016. (Photo by Murad Sezer/Reuters)





A Muslim cleric takes a selfie with Sarah Sewall (C), U.S. Under Secretary for Civilian Security, Democracy and Human Rights, during her visit to the shrine of Sufi Saint Nizamuddin Auliya in New Delhi, India, January 14, 2016. (Photo by Anindito Mukherjee/Reuters)





An Israeli soldier stands guard near the scene where a Palestinian, who the Israeli military said tried to stab an Israeli soldier, was killed by Israeli troops, near the West Bank city of Hebron January 14, 2016. (Photo by Mussa Qawasma/Reuters)





Icicles hang near a board showing currency exchange rates of the U.S. dollar and euro against the rouble in Moscow, Russia January 14, 2016. (Photo by Maxim Shemetov/Reuters)





Soldiers of China's People's Liberation Army (PLA) take part in training in temperatures below minus 30 degrees Celsius (minus 22 degrees Fahrenheit) at China's border with Russia in Fuyuan, Heilongjiang province, January 14, 2016. (Photo by Reuters/China Daily)





Soldiers of China's People's Liberation Army (PLA) take part in training in temperatures below minus 30 degrees Celsius (minus 22 degrees Fahrenheit) at China's border with Russia in Fuyuan, Heilongjiang province, January 14, 2016. (Photo by Reuters/China Daily)





Actor Alan Rickman poses for a photo before a special family fundraising evening hosted by author J.K. Rowling in aid of her children's charity, Lumos, at the "Warner Bros. Studio - The Making of Harry Potter in Hertfordfshire" in London in this November 9, 2013 file photo. Rickman, who played the role of Professor Snape in the Harry Potter films among many others, has died aged 69, his agent said on January 14, 2016. (Photo by Olivia Harris/Reuters)





Girls hold dolls featuring Taiwan's Democratic Progressive Party (DPP) Chairperson and presidential candidate Tsai Ing-wen before she addresses supporters during a campaigning rally in Hsinchu ,Taiwan January 14, 2016. (Photo by Damir Sagolj/Reuters)





A supporter of Taiwan's New Power Party smokes at a rally ahead of the election in Taipei, Taiwan, January 14, 2016. (Photo by Olivia Harris/Reuters)





A maize plant is seen among other dried maize at a field in Hoopstad, a maize-producing district in the Free State province, South Africa, January 13, 2016. South Africa suffered its driest year on record in 2015, the national weather service said on Thursday, as a drought that has threatened the vital maize crop and hit economic growth showed no sign of abating. (Photo by Siphiwe Sibeko/Reuters)





A Burlington Northern Santa Fe (BNSF) train rolls by a statue of the state symbol of the state of Wyoming, a bucking bronco, in Ft. Laramie, Wyoming in this July 15, 2014, file photo. A potential merger of Canadian Pacific Railway Ltd and Norfolk Southern would make it hard for No. 3 U.S. railroad CSX Corp to survive alone and ratchet up pressure for more industry consolidation, the chairman of No. 2 U.S. railroad BNSF said on January 14, 2016. (Photo by Rick Wilking/Reuters)





Brazilian gymnast Arthur Zanetti, gold medallist in the men's gymnastics rings at the London 2012 Olympic Games, attends a training session in his hometown Sao Caetano do Sul, January 14, 2016. (Photo by Paulo Whitaker/Reuters)





Jordanian solders play with Syrian refugee children after they crossed into Jordanian territory with their families, near the town of Ruwaished, at the Hadalat area, east of the capital Amman, January 14, 2016. After months of being stranded at the border, a group of Syrian refugees has finally been allowed to enter Jordan. Jordanian authorities say they have to address security concerns before allowing more refugees into the country burdened with over 1.4 million refugees, said the commander of Jordan's border guard force, Brigadier General Saber Mahayrah. (Photo by Muhammad Hamed/Reuters)





A sign is seen placed outside the venue for the Fox Business Network Republican presidential debate at the North Charleston Coliseum in North Charleston, South Carolina, January 14, 2016. (Photo by Randall Hill/Reuters)





One of four 'Gyoshusha' young men wearing loincloths kneels while poured ice cold water to purify body and soul during the 'Kanchu Misogi' mid winter purification ritual festival in minus 2.9 degrees Celsius temperature at the Samegawa Jinja Shrine on January 13, 2016 in Kikonai, Hokkaido, Japan. The ritual in Kikonai city is thought to be the Japan's northernmost of its kinds started in 1831, continues until Janaury 15. (Photo by The Asahi Shimbun via Getty Images)





Lebanese policemen hit an anti-government protester outside the Environment Ministry during a demonstration in support of activists who were detained after staging a sit-in inside, in downtown Beirut, Lebanon, Thursday, January 14, 2016. Lebanon's trash collection crisis which set off huge protests in the summer is still festering, with no immediate solution on the horizon. (Photo by Bilal Hussein/AP Photo)





A Sikh man rides a motorbike over men lying in the road during a display marking the birthday of Guru Gobind Singh in Allahabad, India on January 14, 2016. (Photo by Prabhat Kumar Verma/ZUMA Press/Corbis)





Tunisian girls attend a rally to mark the fifth anniversary of the Arab Spring, Thursday, January14, 2016 in Tunis. Tunisian teachers, activists and political parties have joined to celebrate five years since protesters drove out their autocratic president and ushered in a democratic era. The crowd at Thursday's rally included families of those killed in weeks of protests against President Zine el Abidine Ben Ali, who fled on Jan. 14, 2011. (Photo by Riadh Dridi/AP Photo)





In this photo taken Wednesday evening, January 13, 2016, firefighters battle a garage fire on Perry Road in Pavilion, N.Y. The structure was completely destroyed. (Photo by Mark Gutman/The Daily News via AP Photo)





Visitors attend the 89th Pitti Immagine Uomo menswear fashion event in Florence, Italy, 14 January 2016. The exhibition of men's clothing and accessory collections runs from 12 to 15 January. (Photo by Maurizio Degl' Innocenti/EPA)





Bulgarian masked men 'Kuker' perform the traditional dance around a bonfire during the carnival in the village of Vatanovci, some 40 km from Sofia, Bulgaria 13 January 2016. This mask-dance 'Kuker' is a pre-Christian tradition of dancing to keep away the evil spirits. (Photo by Vassil Donev/EPA)





A man holds his hat as he passes graffiti along the Danube canal on a windy winter day in Vienna in Vienna, Austria, 13 January 2016. (Photo by Christian Bruna/EPA)





Ammon Bundy speaks to reporters at the Malheur National Wildlife Refuge in Burns, Ore., on Thursday, January 14, 2016. Bundy is the leader of a small, armed group that has been occupying the remote refuge in Oregon since Jan. 2 to protest federal land policies. (Photo by Keith Ridler/AP Photo)





This image provided by The Kavli Foundation on Thursday, January 14, 2016 shows an artist's impression of the superluminous supernova ASASSN-15lh as it would appear from an exoplanet located about 10,000 light-years away in the host galaxy of the supernova. On Thursday, astronomers announced the discovery of the brightest star explosion ever - easily outshining the entire Milky Way galaxy. (Photo by Jin Ma/Beijing Planetarium/The Kavli Foundation via AP Photo)





Kashmiri Muslims grieve as they watch the funeral procession of Owais Bashir Malik in Srinagar, Indian controlled Kashmir, Thursday, January 14, 2016. Police fired warning shots and tear gas Thursday to disperse hundreds of protesters shouting anti-India slogans after the body of a college student with his throat slit was found in the Indian-controlled portion of Kashmir. (Photo by Dar Yasin/AP Photo)





The shadow of Air Force One, with President Barack Obama aboard, casts a shadow over a snow covered field as it approaches Offutt Air Force Base in Bellevue, Neb., Wednesday, January 13, 2016, before landing. The president is en route to Omaha, Neb., where he will speak at University of Nebraska Omaha, and vist with a local family. (Photo by Carolyn Kaster/AP Photo)





A jogger runs through the snow under the Angel of the North near Gateshead, northeastern England Thursday January 14, 2016, as Britain braced itself for a new wave of bad weather after forecasters issued warnings of heavy snow in parts of England and Scotland. (Photo by Owen Humphreys/PA Wire via AP Photo)





Chinese artists from Anhui Hungmei Opera theatre apply makeup backstage before performing "Goddess Marriage" opera in New Delhi, India, Thursday, January 14, 2016. "Goddess Marriage" is a love story between immortal and mortal which was organized by China National Tourism Administration to kick-start 2016 as a year for "China-India Tourism". (Photo by Altaf Qadri/AP Photo)





A supporter takes a photo of her friends as Taiwan's ruling KMT or Nationalist Party presidential candidate Eric Chu arrives at a campaign rally in Taipei, Taiwan, Thursday, January 14, 2016. Taiwan will hold its presidential election on Jan. 16, 2016. (Photo by Wally Santana/AP Photo)





A mourner cries at the funeral of Lokman Acikgoz and his two sons in Cinar, in the mostly-Kurdish Diyarbakir province in southeastern Turkey, Thursday, January 14, 2016. The members of the family were among several people killed late Wednesday when Kurdish militants detonated a car bomb at a police station in Cinar. The force of the blast caused their house, which was near the station, to collapse. Clashes between Turkey's security forces and the rebels of the Kurdistan Workers' Party, or PKK, reignited in July 2015, shattering a fragile peace process. (Photo by Dominique Sequel/AP Photo)





In this June 27, 2013 photo provided by NASA, Sierra Nevada Corp. engineers and technicians prepare the Dream Chaser engineering test vehicle for tow tests at NASA's Dryden Flight Research Center in California. On Thursday, January 14, 2016, NASA announced the Sierra Nevada Corp. will join SpaceX and Orbital ATK in launching cargo to the International Space Station. These flights, yet to be finalized, will run through 2024. (Photo by Ken Ulbrich/NASA via AP Photo)





Peter Prevc of Slovenia competes at the qualification round for the FIS Ski Flying World Championship 2016 during day 1 at the Kulm on January 14, 2016 in Bad Mitterndorf, Austria. (Photo by Alexander Hassenstein/Getty Images/Bongarts)





This photo released by the California Department of Transportation shows a boulder that fell onto a lane of Highway 50 near Kyburz, Calif., Wednesday, January 13, 2016. The heavy rain that poured over the San Francisco Bay Area early Wednesday morning moved east toward the Sierra where a good foot of snow was set to blanket mountain passes. Travelers were warned to expect delays and poor visibility for the passes over Interstate 80 and Highway 50. (Photo by California Department of Transportation via AP Photo)





Cujo, one of the bulls for the Buck Off at Madison Square Garden, is unloaded for a weigh in outside the venue, Thursday, January 14, 2016. The Professional Bull Riders are marking their 10th anniversary competing in New York. (Photo by Richard Drew/AP Photo)





People watch "El Pozo de los Humos" (The Well of the Fumes) waterfall from a scenery viewpoint near Masueco, in the province of Salamanca, Spain on January 13, 2016. Heavy rains in recent days in the Natural Park of Arribes del Duero have caused a great flood in the river Uces that owns the waterfall "The Well of the fumes". (Photo by Cesar Manso/AFP Photo)





Italy's Dorothea Wierer competes to win the women's Individual 15 km competition at the Biathlon World Cup in Ruhpolding, Germany, Thursday, January 14, 2016. (Photo by Matthias Schrader/AP Photo)





Japan's textile maker Gunze employee displays a textile surface touch sensor for a cloth piano at the Wearable Device Technology Expo in Tokyo on January 13, 2016. The device is flexible and made from a foldable knitted material with electric conductivity to play music anywhere. (Photo by Kazuhiro Nogi/AFP Photo)





Indians in tradition garb walk away from a protest outside the General Prosecutor's office in Caracas, Venezuela, Wednesday, January 13, 2016. Dozens of Indians under the cry of "justice, justice," protested outside the General Prosecutor's office the removal of three Amazonas state elected congress members from the National Assembly. The lawmakers were barred by the Supreme Court from taking office due to alleged election irregularities. (Photo by Fernando Llano/AP Photo)





British Artist Zoe Bradle makes finishing touches to her monumental red paper dress sculpture containing 5,940 ruffles at Sotheby's on January 14, 2016 in London, England. (Photo by John Phillips/Getty Images for Sotheby's)





A replica of one of the largest dinosaurs ever discovered is unveiled at the American Museum of Natural History on January 14, 2016 in New York City. The replica of the "Titanosaur" weighs about 70 tons, is 17 feet tall and stretches to nearly 122 feet long. The dinosaur belongs to the titanosaur family and was discovered by Paleontologists in the Patagonian Desert of Argentina in 2014 and lived about 100 to 95 million years ago. The exhibit at the museum features bones, fossils and a fibreglass replica of the creature. (Photo by Spencer Platt/Getty Images)





Students exercise in body training at Bishan Vocational Education Center in Chongqing, southwest China, January 13, 2016. These students were trained to be stewardesses of the high-speed train. (Photo by Xie Jie/Xinhua)