Blood stains are seen at the site of a Saudi-led air strike which struck a house where mourners had gathered for a funeral north of Yemen's capital Sanaa, February 16, 2017. REUTERS/Mohamed al-Sayaghi? 

A pig's head lies on snow in the village of Khrapkovo, Belarus February 3, 2017. REUTERS/Vasily Fedosenko SEARCH "KHRAPKOVO" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Kenya Wildlife Services veterinarians take blood samples of a tranquilised 5-year-old lioness named Nyala as they set up a radio collar on her neck to track her pride's movements at the Nairobi National Park near Nairobi, Kenya January 23, 2017. REUTERS/Thomas Mukoya 

A timeline of pictures from Aleppo, Syria. Restoring full control over Aleppo, Syria's most populous city before the war, has been seen as critical to the fortunes of Syrian President Bashar al-Assad in a multi-sided civil war now in its sixth year. Insurgents who had held the eastern part of the city since the early days of the war effectively agreed to surrender what remained of their besieged enclave and evacuate after a fierce government assault. REUTERS/Staff SEARCH "ALEPPO TIMELINE" FOR THIS STORY TPX IMAGES OF THE DAY Matching text: MIDEAST-CRISIS/SYRIA-ALEPPO 

Football Soccer Britain - Liverpool v West Ham United - Premier League - Anfield - 11/12/16 West Ham United's Andy Carroll with a cut eye during the game Action Images via Reuters / Lee Smith Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

A relative supplies blood to help in the DNA identification of remains of victims of the Pakistan International Airlines (PIA) plane crash at PIMS hospital in Islamabad, Pakistan December 8, 2016. REUTERS/Caren Firouz 

Britain Football Soccer - Manchester United v West Ham United - EFL Cup Quarter Final - Old Trafford - 30/11/16 Blood on the face of Manchester United's Wayne Rooney after sustaining a injury as referee Mike Jones gestures Reuters / Phil Noble Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. TPX IMAGES OF THE DAY 

Britain Football Soccer - Manchester United v West Ham United - EFL Cup Quarter Final - Old Trafford - 30/11/16 Blood on the face of Manchester United's Wayne Rooney after sustaining a injury Reuters / Phil Noble Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Britain Football Soccer - Manchester United v West Ham United - EFL Cup Quarter Final - Old Trafford - 30/11/16 Blood on the face of Manchester United's Wayne Rooney after sustaining a injury as referee Mike Jones gestures Reuters / Phil Noble Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Britain Football Soccer - Manchester United v West Ham United - EFL Cup Quarter Final - Old Trafford - 30/11/16 Blood on the face of Manchester United's Wayne Rooney after sustaining a injury as referee Mike Jones gestures Reuters / Phil Noble Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Iraqi security forces provide medical assistance for an injured man, during a battle with Islamic State militants in Mosul, Iraq, November 30, 2016 REUTERS/Alaa Al-Marjani ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH 

A member of the Iraqi security forces provides medical treatment for an injured man, during a battle with Islamic State militants in Mosul, Iraq, November 30, 2016 REUTERS/Alaa Al-Marjani 

Rugby Union Britain - England v Argentina - 2016 Old Mutual Wealth Series - Twickenham Stadium, London, England - 26/11/16 England's Dan Cole Action Images via Reuters / Henry Browne Livepic EDITORIAL USE ONLY. 

A health technician analyses blood samples for tuberculosis testing in a high-tech tuberculosis lab in Carabayllo in Lima, Peru May 19, 2016. REUTERS/Mariana Bazo SEARCH "TB HOPE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Wrestler known as Gio Malkriado (top) fights with a fluorescent tube with wrestler Ciclope during an extreme wrestling fight at a temporary wrestling ring inside a car wash in Tulancingo Hidalgo, Mexico October 8, 2016. REUTERS/Carlos Jasso SEARCH "LUCHA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Injured boys react at a field hospital after airstrikes on the rebel held areas of Aleppo, Syria November 18, 2016. REUTERS/Abdalrhman Ismail TPX IMAGES OF THE DAY ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH 

Athens' Polytechnic school students carry a blood-stained Greek flag during a rally marking the 43rd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. REUTERS/Alkis Konstantinidis 

A carnation is placed on a blood-stained Greek flag carried by Athens' Polytechnic school students during a rally marking the 43rd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. REUTERS/Alkis Konstantinidis 

Athens' Polytechnic School students carry a blood-stained Greek flag during a rally marking the 43rd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. REUTERS/Alkis Konstantinidis

ATTENTION EDITORS - VISUALS COVERAGE OF SCENES OF DEATH OR INJURY A Yazidi man is injured from a bomb attack in the town of Bashiqa, after it was recaptured from the Islamic State, east of Mosul, Iraq November 10, 2016. REUTERS/Alaa Al-Marjani 

A blood stain is pictured near a hat on the ground after a strike on the rebel held besieged city of Douma, in the eastern Damascus suburb of Ghouta, Syria, November 8, 2016. REUTERS/Bassam Khabieh 

Blood stains the ground after a strike on the rebel held besieged city of Douma, in the eastern Damascus suburb of Ghouta, Syria, November 8, 2016. REUTERS/Bassam Khabieh 

Blood stains the damaged ground after a strike on the rebel held besieged city of Douma, in the eastern Damascus suburb of Ghouta, Syria November 8, 2016. REUTERS/Bassam Khabieh 

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis 

Football Soccer -Panathinaikos v Standard Liege - Europa League Group Stage - Apostolos Nikolaidis stadium, Athens, Greece - 03/11/2016. An injured riot police officer reacts during clashes with Standard Liege fans. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

A man walks inside a room in which five people were killed in Manila, Philippines early November 1, 2016. According to police and witnesses, unknown masked gunmen killed five people inside a house that is a known drug den. REUTERS/Damir Sagolj REUTERS/Damir Sagolj 

A funeral parlour worker, whose hands are bloodied from carrying bodies of killed people, rests against the wall of a house in Manila, Philippines early November 1, 2016. According to police and witnesses, unknown masked gunmen killed five people inside a house that is a known drug den. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY

An injured supporter of Pakistani opposition leader Imran Khan sits in an ambulance after clashes between police and protesters in Swabi, between Peshawar and Islamabad, Pakistan October 31, 2016. REUTERS/Fayaz Aziz 

An injured Venezuelan National Guard walks away during a rally demanding a referendum to remove Venezuela's President Nicolas Maduro in San Cristobal, Venezuela October 26, 2016. REUTERS/Carlos Eduardo Ramirez 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH A policeman holds a bag with bloodied doll and other belongings of a 17 year old girl that was killed together with her friend by unknown motorcycle-riding gunmen in an alley in Manila, Philippines early October 26, 2016. According to the police, a sign on a cardboard reading "Tulak ka, hayop ka", which translates to "You are a (drug) pusher, you are an animal" was found with the the body of girl's killed friend. REUTERS/Damir Sagolj

A blood stained stretcher lies on a wall after shelling in the rebel held besieged town of Douma, eastern Ghouta in Damascus, Syria October 24, 2016. REUTERS/Bassam Khabieh 

A Kurdish Peshmerga fighter is seen bloodied following a road side bomb on their vehicle during a battle with Islamic State militants at Topzawa village near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

A Kurdish Peshmerga fighter is seen bloodied following a road side bomb attack on their vehicle during a battle with Islamic State militants at Topzawa village, near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

REFILE - UPDATING CAPTION TO REUTERS STYLE A Kashmiri Shi'ite Muslim bleeds after he flagellated himself during a Muharram procession to mark Ashura in Srinagar October 12, 2016. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

Football Soccer - Brazil v Bolivia - World Cup 2018 Qualifier - Dunas Arena Stadium, Natal, Brazil - 6/10/16. Brazil's Neymar injured. REUTERS/Ricardo Moraes

Stanley Ferdinand filets large trout he caught in Great Bear Lake in Deline, Northwest Territories, Canada September 8, 2016. REUTERS/Pat Kane TPX IMAGES OF THE DAY SEARCH "DELINE KANE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES. 

A devotee of the Chinese Ban Tha Rue shrine with knives piercing his face takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016. REUTERS/Jorge Silva TPX IMAGES OF THE DAY

A devotee of the Chinese Ban Tha Rue shrine with knives piercing his face takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016. REUTERS/Jorge Silva 

A devotee of the Chinese Ban Tha Rue shrine with piercings of stems at her face take part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016 . REUTERS/Jorge Silva 

A devotee of the Chinese Ban Tha Rue shrine takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016. REUTERS/Jorge Silva 

A devotee of the Chinese Ban Tha Rue shrine takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016. REUTERS/Jorge Silva 

A devotee of the Chinese Ban Tha Rue shrine with knives piercing his face takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand October 5, 2016. REUTERS/Jorge Silva 

A devotee of the Chinese Ban Tha Rue shrine with piercings of stems at her face takes part in a procession celebrating the annual vegetarian festival in Phuket, Thailand, October 5, 2016 . REUTERS/Jorge Silva 

Blood stains the ground while workers remove rubble in a damaged wedding hall after a suicide attack on a Kurdish wedding in Hasaka city, Syria October 4, 2016. REUTERS/Rodi Said 

Blood stains the ground of a damaged wedding hall after a suicide attack on a Kurdish wedding in Hasaka city, Syria October 4, 2016. REUTERS/Rodi Said 

A devotee of the Chinese Samkong Shrine walks while cutting his tongue with an axe during a procession celebrating the annual vegetarian festival in Phuket, Thailand October 4, 2016. REUTERS/Jorge Silva TPX IMAGES OF THE DAY 

Devotees of the Chinese Samkong Shrine walk while cutting their tongues with axes during a procession celebrating the annual vegetarian festival in Phuket, Thailand October 4, 2016. REUTERS/Jorge Silva 

Devotees of the Chinese Samkong Shrine walk while cutting their tongues with axes during a procession celebrating the annual vegetarian festival in Phuket, Thailand October 4, 2016. REUTERS/Jorge Silva 

A devotee of the Chinese Samkong Shrine walks while cutting his tongue with an axe during a procession celebrating the annual vegetarian festival in Phuket, Thailand October 4, 2016. REUTERS/Jorge Silva 

Bloodstains are seen as civil defence members work at a site hit by an airstrike in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria, September 25, 2016. REUTERS/Khalil Ashawi 

Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
Reuters / Hannah McKay
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
Reuters / Hannah McKay
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
Reuters / Hannah McKay
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Britain Football Soccer - AFC Bournemouth v Everton - Premier League - Vitality Stadium - 24/9/16
Bournemouth's Adam Smith with an injury to his face
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Blood covers the pavement where a person was shot in uptown Charlotte, NC during a protest of the police shooting of Keith Scott, in Charlotte, North Carolina, U.S. September 21, 2016. REUTERS/Jason Miczek TPX IMAGES OF THE DAY

Blood covers the pavement where a person was shot in uptown Charlotte, NC during a protest of the police shooting of Keith Scott, in Charlotte, North Carolina, U.S. September 21, 2016. REUTERS/Jason Miczek 

Blood covers the pavement where a person was shot in uptown Charlotte, NC during a protest of the police shooting of Keith Scott, in Charlotte, North Carolina, U.S. September 21, 2016. REUTERS/Jason Miczek 

A butcher's foot is covered in hair and blood after slaughtering a goat during Eid al-Adha in Delhi, India September 14, 2016. REUTERS/Cathal McNaughton TPX IMAGES OF THE DAY