American big wave surfer Nic Lamb drops a wave off Praia do Norte in Nazare, Portugal during the first edition of the World Surf League's Nazare Challenge on December 20, 2016. (Photo by Francisco Leong/AFP Photo)





Big-wave surfer Tom Butler of Britain drops in on a large wave during Nazare Challenge championship at Praia do Norte in Nazare, Portugal, December 20 2016. (Photo by Rafael Marchante/Reuters)





An Afghan officer reacts in front of a burning pile of seized narcotics and alcoholic drinks, in the outskirts of Kabul, Afghanistan December 20, 2016. (Photo by Omar Sobhani/Reuters)





An Afghan policeman watches as a cache of alcohol and drugs burns on the outskirts of Kabul on December 20, 2016. Ninety eight tons of opium, heroin, hashish and alcoholic drinks were set on fire, officials said. (Photo by Shah Marai/AFP Photo)





A child, whose eyelash frozen due to the cold weather while she goes to school, poses for a photo at –28 Celcius in Ardahan, Turkey on December 20, 2016. (Photo by Gunay Nuh/Anadolu Agency/Getty Images)





A South Korean diver wearing a Santa Claus outfit swims with fish in a tank during a Christmas event at the Lotte World Aquarium in Seoul on December 20, 2016. Christmas is one of the biggest holidays celebrated in South Korea with Christians forming over half the population. (Photo by Jung Yeon-Je/AFP Photo)





A South Korean diver wearing a Santa Claus outfit swims with fish in a tank during a Christmas event at the Lotte World Aquarium in Seoul on December 20, 2016. (Photo by Jung Yeon-Je/AFP Photo)





Worshippers gather around a huge incense burner as they offer their prayers at the Sensoji Buddhist temple in Asakusa district of Tokyo, Tuesday, December 20, 2016. Asakusa annually draws many tourists from around the world. (Photo by Shizuo Kambayashi/AP Photo)





Principle Ballet Dancer, Ekaterina Bulgutova, of the Russian State Ballet, with the Nutcracker part of Christmas Ballet Season in Cardiff which starts at St Davids Hall on December 20, 2016 in Cardiff, England. (Photo by Kiran Ridley/Barcroft Images)





Members of a Turkish forces honour guard carry the Russian flag-draped coffin of late Russian Ambassador to Turkey Andrei Karlov and a picture of him during a ceremonial farewell with full state honours on the tarmac of Ankara's Esenboga Airport on December 20, 2016, before the coffin is transported on a Russian plane for Moscow. Veteran diplomat Andrei Karlov was shot nine times in the back by an off-duty Turkish policeman at the opening of an exhibition of Russian photography on December 19, 2016. The brazen killing stunned Ankara and Moscow, which have rowed repeatedly over the Syria conflict but in recent weeks have begun cooperating closely on the evacuations from war-wrecked Aleppo. (Photo by Adem Altan/AFP Photo)





The body of Russia' s Ambassador to Turkey Andrei Karlov has been delivered to Vnukovo International Airport by a charter flight. Karlov was shot dead on December 19, 2016 in Ankara' s Contemporary Art Centre. (Photo by Valery Sharifulin/TASS)





Andrei Karlov' s widow Marina (L front) and mother Maria (C) weep over the body of Russia' s Ambassador to Turkey, delivered to Vnukovo International Airport by a charter flight. Karlov was shot dead on December 19, 2016 in Ankara' s Contemporary Art Centre. Pictured in this image are Turkey' s Foreign Minister Mevlut Cavusoglu (L back) and his Russian counterpart Sergei Lavrov (R). (Photo by Valery Sharifulin/TASS)





The body of Russia' s Ambassador to Turkey Andrei Karlov has been delivered to Vnukovo International Airport by a charter flight. Karlov was shot dead on December 19, 2016 in Ankara' s Contemporary Art Centre. (Photo by Valery Sharifulin/TASS)





A Yemeni tribesman from the Popular Resistance Committee, supporting forces loyal to Yemen's Saudi-backed President Abedrabbo Mansour Hadi, fires a weapon as a fellow tribesman rescues the body of a dead comrade in the country's third-city of Taez during clashes with Shiite Huthi rebels, on December 19, 2016. (Photo by Ahmad Al-Basha/AFP Photo)





A celebration activity for the opening of the Sun Island International Snow Sculpture Art Expo is held in Harbin, capital of northeast China's Heilongjiang Province, December 20, 2016. The expo kicked off on Monday with its large scale, fantastic ice and snow sculptures and various snow activities. (Photo by Wang Jianwei/Xinhua/Barcroft Images)





A local resident dressed as a clown helps a firefighter at the scorched ground of Mexico's best-known fireworks market after an explosion explosion ripped through it, inTultepec, Mexico, Tuesday, December 20, 2016. National Civil Protection Coordinator Luis Felipe Puente told Milenio TV that dozens were hurt but he had no immediate report of any fatalities at the open-air San Pablito Market in Tultepec, in the State of Mexico. (Photo by Eduardo Verdugo/AP Photo)





A woman jumps into a pool dug in the frozen river at Beiling Park in the smog on December 20, 2016 in Shenyang, Liaoning Province of China. Winter swimmers exercised in the smog in Shenyang. At least 24 cities in North China issued red alerts on Dec 16 as heavy smog will shroud the country's northern regions in the following days. (Photo by VCG/VCG via Getty Images)





Police provide security outside a court at the blasphemy trial of Jakarta's incumbent governor Basuki Tjahaja Purnama, also known as Ahok, in Jakarta, Indonesia, December 20, 2016. (Photo by Darren Whiteside/Reuters)





A Vietnamese school-girl holds Vietnamese and Cambodian flags while she waits for the arrival of Cambodia's Prime Minister Hun Sen at the Presidential Palace in Hanoi, Vietnam December 20, 2016. (Photo by Reuters/Kham)





Vietnamese school-girls wave Vietnamese and Cambodian flags as a limousine transports Cambodia's Prime Minister Hun Sen, at the Presidential Palace in Hanoi, Vietnam December 20, 2016. (Photo by Reuters/Kham)





Israeli-Arab Issa Kassissieh wears a Santa Claus costume as he rides a camel during an annual Christmas tree distribution by the Jerusalem municipality, in Jerusalem's Old City December 20, 2016. (Photo by Amir Cohen/Reuters)





An employee of Israeli company Percepto prepares to fly the company's fully autonomous drone during a demonstration for Reuters at their offices in Modiin, Israel December 1, 2016. An Israeli company says it has developed a fully autonomous commercial drone system that can provide around-the-clock service and security, without the need for human intervention, at sensitive and strategic sites. By using sensors and real-time computer vision technology, the company, Percepto, says its drone system is able to deal with ad-hoc situations and react autonomously to potential security threats. In addition, it can carry out safety missions such as detecting smoke or gas leaks, and conduct routine inspections to identify abnormalities such as corrosion or damage to infrastructure, the company's Chief Commercial Officer, Ariel Avitan, says. (Photo by Baz Ratner/Reuters)





Congolese riot policemen take a break during demonstrations against President Joseph Kabila in Lingwala Municipality of the Democratic Republic of Congo's capital Kinshasa, December 20, 2016. (Photo by Robert Carrubba/Reuters)





A Congolese protester lies on the ground after police opened fire wth rubber bullets whilst they protest outside the Democratic Republic of the Congo's Embassy in defiance of their President, Joseph Kabila on December 20, 2016 in Pretoria. The United Nations voiced alarm over a wave of arrests in the Democratic Republic of Congo, where tensions were running high after President Joseph Kabila's term in office expired. Tuesday marked the end of the second and constitutionally-mandated final term for the 45-year-old, who inherited the presidency after the 2001 assassination of his father. But he is now refusing to leave the job that he began without much fanfare. (Photo by John Wessels/AFP Photo)





A man carries a chair as he walks past a 'traffic robot' operating during demonstrations against President Joseph Kabila in Lingwala Municipality of the Democratic Republic of Congo's capital Kinshasa, December 20, 2016. (Photo by Robert Carrubba/Reuters)





Residents chant slogans against Congolese President Joseph Kabila as peacekeepers serving in the United Nations Organization Stabilization Mission in the Democratic Republic of the Congo (MONUSCO) patrol during demonstrations in the streets of the Democratic Republic of Congo's capital Kinshasa, December 20, 2016. (Photo by Thomas Mukoya/Reuters)





Residents chant slogans against Congolese President Joseph Kabila during demonstrations in the streets of the Democratic Republic of Congo's capital Kinshasa, December 20, 2016. (Photo by Thomas Mukoya/Reuters)





French rescue services work at the scene of an accident involving fifty vehicles which crashed due to fog on the road between La Roche-sur-Yon and Sables-d'Olonne, France, that killed five and injured more than forty, December 20, 2016. (Photo by Stephane Mahe/Reuters)





French rescue services work at the scene of an accident involving fifty vehicles which crashed due to fog on the road between La Roche-sur-Yon and Sables-d'Olonne, France, that killed five and injured more than forty, December 20, 2016. (Photo by Stephane Mahe/Reuters)





French police stand guard as tourists visit the traditional Christkindelsmaerik (Christ Child market) as emergency security measures continue during the Christmas holiday season in Strasbourg, France, December 20, 2016. (Photo by Vincent Kessler/Reuters)





People surround a new An-132D cargo plane during its presentation at the Antonov aircraft plant in Kiev, Ukraine, December 20, 2016. (Photo by Valentyn Ogirenko/Reuters)





People surround a new An-132D cargo plane during its presentation at the Antonov aircraft plant in Kiev, Ukraine, December 20, 2016. (Photo by Valentyn Ogirenko/Reuters)





An employee of a local breed livestock farm sits on a cart while transporting the feed for cattle in the village of Manychskoye in Stavropol region, Russia, December 20, 2016. (Photo by Eduard Korniyenko/Reuters)





A girl sleeps on the floor near coffins containing the bodies of Domingo Manosca, who according to relatives was a drug user, and his 5-year-old son Francisco Manosca, during their wake inside a village community centre in Pasay city, Metro Manila, Philippines, December 20, 2016. According to relatives and neighbors, unidentified gunmen opened fire in their home, killing both the father and child. (Photo by Ezra Acayan/Reuters)





In this Thursday, December 15, 2016 photo, a Sri Lankan port worker welds steel frames to assemble an enormous, artificial Christmas tree on a popular beachside promenade in Colombo, Sri Lanka. Hundreds of Sri Lanka’s port workers and volunteers are struggling to put up the towering Christmas tree in time for the holidays. The majority-Buddhist nation is aiming to beat the world record for the tallest, artificial Christmas tree as a show of multicultural respect. But twice the construction deadline was missed, and now organizers hope to erect the tree on Christmas Eve. The Catholic Church has criticized the $80,000 price tag as a waste of money that is better spent helping the poor. (Photo by Eranga Jayawardena/AP Photo)





Christian militia fighters from the Nineveh Plain Protection Units (NPU) drive a pick- up truck in Qaraqosh (also known as Hamdaniya), transporting four men, allegedly members of the Islamic State (IS) group that were found inside a tunnel in Mosul, on December 20, 2016. (Photo by J.M. Lopez/AFP Photo)





A member of the Iraqi security forces stands guard in the watchtower as concrete blockades are lifed in order to remove checkpoints, in Baghdad, Iraq December 20, 2016. (Photo by Ahmed Saad/Reuters)





Ahmad Khan Rahimi, the man accused of setting off bombs in New Jersey and New York in September, injuring more than 30 people, is led into court Tuesday, December 20, 2016, in Elizabeth, N.J. (Photo by Mel Evans/AP Photo)





This image made from video provided by APTN, shows a view from a drone of smoke billowing from the San Pablito Market, where an explosion ripped through a fireworks market in Tultepec, Mexico, Tuesday, December 20, 2016. Sirens wailed and a heavy scent of gunpowder lingered in the air after the afternoon blast at the market, where most of the fireworks stalls were completely leveled. According to the Mexico state prosecutor there are dozens dead. (Photo by Pro Tultepec via APTN Photo)





Shattered glass is seen on the windshield of a truck the morning after it ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)





A policewoman places a candle on behalf of a mourner at a makeshift memorial the day after a truck drove into a crowded Christmas market in the city center on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen yesterday morning. (Photo by Sean Gallup/Getty Images)





A German police officer stands next to a merry-go-round in the Christmas market in Frankfurt, Germany, Tuesday, December 20, 2016 one day after a truck ran into a crowded Christmas market in Berlin killing several people. (Photo by Michael Probst/AP Photo)