Thick smoke rises from a fire which broke out at oil wells set ablaze by Islamic State militants before fleeing the oil-producing region of Qayyara, Iraq, January 18, 2017. Picture taken January 18, 2017. REUTERS/Girish Gupta     TPX IMAGES OF THE DAY

Girish Gupta/Reuters

Thick smoke rises from a fire which broke out at oil wells set ablaze by Islamic State militants before fleeing the oil-producing region of Qayyara, Iraq. Photo Girish Gupta/Reuters 

Picture taken with long time exposure shows light traces of cars driving on the A2 highway at the exit "Lehrte" near Hanover, central Germany, on January 17, 2018. / AFP PHOTO / dpa / Julian Stratenschulte / Germany OUTJULIAN STRATENSCHULTE/AFP/Getty Images

Julian Stratenschulte/AFP/Getty

Picture taken with long time exposure shows light traces of cars driving on the A2 highway at the exit “Lehrte” near Hanover, central Germany. Photo Julian Stratenschulte/AFP/Getty

A picture taken on January 17, 2016 shows a murmuration of starlings in the sky of Pontevedra, northwestern Spain. / AFP PHOTO / MIGUEL RIOPAMIGUEL RIOPA/AFP/Getty Images

Miguel Riopa/AFP/Gety

A murmuration of starlings are seen in the sky of Pontevedra, northwestern Spain. Photo Miguel Riopa/AFP/Getty 

TOPSHOT - This handout image received courtesy of Doctors Without Border (MSF) on January 17, 2017, shows a wounded child after an air force jet accidentally bombarded a camp for those displaced by Boko Haram Islamists, in Rann, northeast Nigeria. At least 52 aid workers and civilians were killed on January 17, 2017, when an air force jet accidentally bombed a camp in northeast Nigeria instead of Boko Haram militants, medical charity MSF said. / AFP PHOTO / Médecins sans Frontières (MSF) / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / DOCTORS WITHOUT BORDERS (MSF)

MSF/AFP

A child lies injured after an air force jet accidentally bombarded a camp for those displaced by Boko Haram Islamists, in Rann, northeast Nigeria according to medical charity MSF. Photo MSF/AFP

A military vehicle of the Iraqi Special Operations Forces is seen during an operation to clear the al-Zirai district of Islamic State militants in Mosul

Muhammad Hamed/Reuters

A military vehicle of the Iraqi Special Operations Forces (ISOF) is seen during an operation to clear the al-Zirai district of Islamic State militants in Mosul, Iraq. Photo Muhammad Hamed/Reuters

ennis - Australian Open - Melbourne Park, Melbourne, Australia - 18/1/17 Victor Estrella Burgos of the Dominican Republic in action during his Men's singles second round match against Australia's Bernard Tomic. REUTERS/Jason Reed

Jason Reed/Reuters

Victor Estrella Burgos of the Dominican Republic in action during his Men’s singles second round match against Australia’s Bernard Tomic at the Australian Open, Melbourne, Australia. Photo Jason Reed/Reuters

A vendor helps put on a wig on a customer at a wig shop near the central train station in Shanghai

Aly Song/Reuters

A vendor helps put on a wig on a customer at a wig shop near the central train station in Shanghai, China. Photo Aly Song/Reuters

Israeli policemen detain a Bedouin man during clashes that followed a protest against home demolitions on January 18, 2017 in the Bedouin village of Umm al-Hiran, which is not recognized by the Israeli government, near the southern city of Beersheba, in the Negev desert. An Israeli policeman was killed while taking part in an operation to demolish homes in the Bedouin village, with authorities claiming he was targeted in a car-ramming attack. The driver was earlier reported shot dead by police as residents disputed the police version of events, saying the driver was heading to the scene to talk with authorities in an attempt to halt the demolitions. / AFP PHOTO / AHMAD GHARABLIAHMAD GHARABLI/AFP/Getty Images

Ahmad Gharabli/AFP/Getty

Israeli policemen detain a Bedouin man during clashes that followed a protest against home demolitions in the Bedouin village of Umm al-Hiran, which is not recognised by the Israeli government, near the southern city of Beersheba, in the Negev desert. Photo Ahmad Gharabli/AFP/Getty

A group of women gather at Knitty City in New York on January 17, 2017 to make their pink Pussyhats in preparation for protests, in Washington and New York, for women's rights following the election of Donald Trump. / AFP PHOTO / William EDWARDSWILLIAM EDWARDS/AFP/Getty Images

William Edwards/AFP/Getty

A group of women gather at Knitty City in New York to make their pink Pussyhats in preparation for protests, in Washington and New York, for women’s rights following the election of Donald Trump. Photo William Edwards/AFP/Getty

A man holds a sign while standing next to a place officer in front of the offices of the financial firm Goldman Sachs during a protest against the company's involvement and influence with the incoming Trump administration in New York, New York, USA, 17 January 2017. The group was planning on camping out in front of the company's offices until 20 January when US President-elect Trump is scheduled to be sworn in as the next US President.  EPA/JUSTIN LANE

Justin Lane/EPA

A man holds a sign while standing next to a place officer in front of the offices of the financial firm Goldman Sachs during a protest against the company’s involvement and influence with the incoming Trump administration in New York, New York, USA. Photo Justin Lane/EPA 

Brexit

Stefan Rousseau/PA Wire

A Bureau de Change in Westminster in London, following Prime Minister Theresa May’s speech at Lancaster House in London, where she outlined her plans for Brexit, saying that she does not want an outcome which leaves the UK “half in, half out” of the European Union. Photo Stefan Rousseau/PA Wire

Artist Kaya Mar holds his latest painting of Theresa May dressed as a police officer holding a truncheon with 'Hard Brexit' written on it in front of the Houses of Parliament on January 17, 2017 in London, England. Today in a long awaited speech, British Prime Minister Theresa May outlined the prioirites for the United Kingdom in Brexit negotiations.  (Photo by Chris J Ratcliffe/Getty Images)

Chris J Ratcliffe/Getty

Artist Kaya Mar holds his latest painting of Theresa May dressed as a police officer holding a truncheon with ‘Hard Brexit’ written on it in front of the Houses of Parliament in London, England. Today in a long awaited speech, British Prime Minister Theresa May outlined the prioirites for the United Kingdom in Brexit negotiations. Photo Chris J Ratcliffe/Getty

Prime Minister Theresa May leaves the room after speaking at Lancaster House in London where she outlined her plans for Brexit, saying that she does not want an outcome which leaves the UK "half in, half out" of the European Union. PRESS ASSOCIATION Photo. Picture date: Tuesday January 17, 2017. See PA story POLITICS Brexit. Photo credit should read: Kirsty Wigglesworth/PA

Kirsty Wigglesworth/PA

Boris Johnson, centre applauds Theresa May as she leaves the room after speaking at Lancaster House in London where she outlined her plans for Brexit. Photo Kirsty Wigglesworth/PA

MLK Day Miami

AP Photo/Wilfredo Lee

People aboard a float from Florida International University wave to crowds during a parade honouring the Rev. Martin Luther King Jr, in the Liberty City neighbourhood of Miami. Photo AP Photo/Wilfredo Lee

A worker combs the wig of a wax figure of U.S. President-elect Donald Trump before it's inauguration at the Wax museum in Madrid, Spain, Tuesday, Jan. 17, 2017. (AP Photo/Paul White)

Paul White/AP

A worker combs the wig of a wax figure of U.S. President-elect Donald Trump before it’s inauguration at the Wax museum in Madrid, Spain. Photo Paul White/AP 

An attendee films Xi Jinping, China's president, on a mobile device as he speaks during the opening plenary session of the World Economic Forum (WEF) annual meeting in Davos, Switzerland, on Tuesday, Jan. 17, 2017. World leaders, influential executives, bankers and policy makers attend the 47th annual meeting of the World Economic Forum (WEF) in Davos from Jan. 17-20. Photographer: Simon Dawson/Bloomberg

Simon Dawson/Bloomberg

An attendee films Xi Jinping, China’s president, on a mobile device as he speaks during the opening plenary session of the World Economic Forum annual meeting in Davos, Switzerland. Photo Simon Dawson/Bloomberg

Serbia's Novak Djokovic makes a backhand return to Spain's Fernando Verdasco during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 17, 2017. (AP Photo/Andy Brownbill)

Andy Brownbill/AP

Serbia’s Novak Djokovic makes a backhand return to Spain’s Fernando Verdasco during their first round match at the Australian Open tennis championships in Melbourne, Australia. Photo Andy Brownbill/AP

A man rides a horse through a bonfire as part of a ritual in honor of Saint Anthony the Abbot, the patron saint of domestic animals, in San Bartolome de Pinares, about 100 km west of Madrid, Spain on Monday, Jan. 16, 2017. On the eve of Saint Anthony's Day, hundreds ride their horses through the narrow cobblestone streets of the small village of San Bartolome during the "Luminarias," a tradition that dates back 500 years and is meant to purify the animals with the smoke of the bonfires and protect them for the year to come. (AP Photo/Emilio Morenatti)

Emilio Morenatti/AP

A man rides a horse through a bonfire as part of a ritual in honour of Saint Anthony the Abbot, the patron saint of domestic animals, in San Bartolome de Pinares on Monday evening. Photos AP Photo/Emilio Morenatti 

Kashmiri women watch the funeral procession of Adil Reshi, a suspected rebel in Hussainpora 55 Kilometers (34 miles) south of Srinagar, Indian controlled Kashmir, Monday, Jan. 16, 2017. Thousands participated in the funerals of three suspected rebels who were killed in an overnight gun-battle with Indian security forces Monday. (AP Photo/Dar Yasin)

Dar Yasin/AP

Kashmiri women watch the funeral procession of Adil Reshi, a suspected rebel in Hussainpora. Thousands participated in the funerals of three suspected rebels who were killed in an overnight gun-battle with Indian security forces on Monday. Photo Dar Yasin/AP 

A group of inmates stand on a roof inside the State Penitentiary of Alcacuz in Nisia Floresta near Natal, Rio Grande do Norte, Brazil, 16 January 2017. Police on 15 January said they had regained control over the prison where at least 30 inmates died in a riot that started on 14 January 2017.  EPA/Ney Douglas  HANDOUT EDITORIAL USE ONLY/NO SALES

Ney Douglas/EPA

A group of inmates stand on a roof inside the State Penitentiary of Alcacuz in Nisia Floresta near Natal, Rio Grande do Norte, Brazil. On Sunday Police said they had regained control over the prison where at least 30 inmates died in a riot that started on Saturday. Photo Ney Douglas/EPA