Visitors wearing traditional hanbok dress walk through Gyeongbokgung palace during snowfall in central Seoul on December 13, 2018. (AFP)

Activists demonstrate against US President Donald Trump's wall prototypes next to the Mexico-US border fence in Tijuana, Baja California state, Mexico on December 12, 2018. - As thousands of Central American migrants, mostly Hondurans, have trekked for over a month in the hopes of reaching the United States, President Donald Trump told Democratic leaders at the White House on Tuesday that he will shut down the US government because they refuse to approve billions of dollars in funding for his controversial Mexico border wall. (AFP)

People participate in a memorial ceremony at the Nanjing Massacre Memorial Hall on the annual national day of remembrance to commemorate the 81st anniversary of the massacre in Nanjing in China's eastern Jiangsu province on December 13, 2018. (AFP)

Members of the French police special forces RAID take part in an operation, on December 13, 2018 in Strasbourg, as part of the hunt for the gunman who killed three people and injured 13 others in an attack on Strasbourg’s Christmas market. (AFP)

President of the European Commission Jean-Claude Juncker whispers in the ear of Britain's Prime Minister Theresa May (R) as she arrives to attend a European Summit aimed at discussing the Brexit deal, the long-term budget and the single market on December 13, 2018 in Brussels. - The 27 European leaders gather for a crucial European Union summit with the British Prime Minister seeking a compromise to save the Brexit deal. (AFP)

Virgin Galactic's SpaceshipTwo takes off for a suborbital test flight on December 13, 2018, in Mojave, California. - Virgin Galactic marked a major milestone on Thursday as its spaceship made it to a peak height, or apogee, of 51.4 miles (82.7 kilometers), after taking off attached to an airplane from Mojave, California, then firing its rocket motors to reach new heights. (AFP)

A man holds a portrait of Norbert Zongo as thousands of people take part in a demonstration on December 13, 2018, in Ouagadougou, Burkina Faso, to mark the 20th anniversary of the assassination of Burkinabe investigative reporter Norbert Zongo. ( AFP)

A Palestinian uses a piece of wood to move a burning tire during clashes with Israeli troops in Ramallah, near the Jewish settlement of Beit El, in the occupied West Bank on December 13, 2018. - A Palestinian shot dead two Israeli soldiers at a bus stop in the occupied West Bank, the military said, sparking raids in the West Bank city of Ramallah in which one Palestinian was killed. The attack came hours after security forces killed two Palestinian murder suspects, with fears of wider unrest. (AFP)

A man walks past smoke rising from a fire at the independent national electoral commission's (CENI) warehouse on December 13, 2018 in Kinshasa, ten days ahead of presidential elections. (AFP)