French riot police apprehend a masked and hooded protester after clashes at a demonstration during a national day of strikes by public sector workers, in Paris, France, May 22, 2018. REUTERS/Christian Hartmann 

Loved ones react after learning that her son-in-law, whom police said was a suspected drug pusher, was killed during an anti-drug operation in metro Manila, Philippines, November 15, 2016. REUTERS/Romeo Ranoco 

Loved ones react after learning that her son-in-law, whom police said was a suspected drug pusher, was killed during an anti-drug operation in metro Manila, Philippines, November 15, 2016. REUTERS/Romeo Ranoco 

A police officer prevents loved ones to go near at their house to see the body of a dead man whom police said is a suspected drug pusher killed during an anti-drug operation in metro Manila, Philippines, November 15, 2016. REUTERS/Romeo Ranoco 

A police officer prevents loved ones to go near at their house to see the body of a dead man whom police said is a suspected drug pusher killed during an anti-drug operation in metro Manila, Philippines, November 15, 2016. REUTERS/Romeo Ranoco 

Britain Boxing - Tony Bellew v BJ Flores WBC World Cruiserweight Title - Liverpool Echo Arena - 15/10/16
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Britain Boxing - Tony Bellew v BJ Flores WBC World Cruiserweight Title - Liverpool Echo Arena - 15/10/16
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Britain Boxing - Tony Bellew v BJ Flores WBC World Cruiserweight Title - Liverpool Echo Arena - 15/10/16
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Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16Croatia fan celebrates on the pitch as a steward attempts to restrain himREUTERS/Christian HartmannLivepic TPX IMAGES OF THE DAY 

Football Soccer - Turkey v Croatia - EURO 2016 - Group D - Parc des Princes, Paris, France - 12/6/16
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Britain Soccer Football - West Ham United v Swansea City - Barclays Premier League - Upton Park - 15/16 - 7/5/16
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Britain Soccer Football - Gillingham v Millwall - Sky Bet Football League One - KRBS Priestfield Stadium - 8/5/16
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Britain Soccer Football - Gillingham v Millwall - Sky Bet Football League One - KRBS Priestfield Stadium - 8/5/16
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Britain Football Soccer - Chelsea v Tottenham Hotspur - Barclays Premier League - Stamford Bridge - 2/5/16
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Britain Football Soccer - Chelsea v Tottenham Hotspur - Barclays Premier League - Stamford Bridge - 2/5/16
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Police officers forcibly restrain a protester at U.S. Republican presidential candidate Donald Trump's campaign rally in Fayetteville, North Carolina March 9, 2016. Trump was interrupted repeatedly by demonstrators during his rally. REUTERS/Jonathan Drake 

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Football Soccer - Leicester City v West Bromwich Albion - Barclays Premier League - King Power Stadium - 1/3/16
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Young Pokot men restrain a bull as they prepare to extract blood from its neck with an arrow, during an initiation ceremony of young men in Baringo County, Kenya, January 20, 2016. Far from the bustling city of Nairobi, in an isolated corner of Kenya's Rift Valley, young men from the Pokot community spear a bull in a ceremony called Sapana that takes them into adulthood. Following the ritual improves men's marriage prospects, provided they can amass a dowry of livestock for their bride. Initiates can also take part in local decision-making in a region where tradition remains strong and cattle play a central part in daily life. REUTERS/Siegfried Modola PICTURE 9 OF 24 - SEARCH "POKOT" FOR ALL IMAGES 

Young Pokot men restrain a bull as another prepares to shoot an arrow with a shallow point into its neck to extract blood, during an initiation ceremony in Baringo County, Kenya, January 20, 2016. Far from the bustling city of Nairobi, in an isolated corner of Kenya's Rift Valley, young men from the Pokot community spear a bull in a ceremony called Sapana that takes them into adulthood. Following the ritual improves men's marriage prospects, provided they can amass a dowry of livestock for their bride. Initiates can also take part in local decision-making in a region where tradition remains strong and cattle play a central part in daily life. REUTERS/Siegfried Modola PICTURE 11 OF 24 - SEARCH "POKOT" FOR ALL IMAGES 

Young Pokot men restrain a bull as they extract blood from its neck, during an initiation ceremony of young men in Baringo County, Kenya, January 20, 2016. Far from the bustling city of Nairobi, in an isolated corner of Kenya's Rift Valley, young men from the Pokot community spear a bull in a ceremony called Sapana that takes them into adulthood. Following the ritual improves men's marriage prospects, provided they can amass a dowry of livestock for their bride. Initiates can also take part in local decision-making in a region where tradition remains strong and cattle play a central part in daily life. REUTERS/Siegfried Modola PICTURE 13 OF 24 - SEARCH "POKOT" FOR ALL IMAGES 

An Israeli policeman prevents a Palestinian man from entering the compound which houses al-Aqsa mosque, known by Muslims as the Noble Sanctuary and by Jews as the Temple Mount, in Jerusalem's Old City September 28, 2015. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

Israeli policemen prevent Palestinian women from entering the compound which houses al-Aqsa mosque, known by Muslims as the Noble Sanctuary and by Jews as the Temple Mount, in Jerusalem's Old City September 22, 2015. REUTERS/Ammar Awad

A Palestinian policeman reacts next to fellow police officers as he tries to prevent Palestinian demonstrators (not pictured) from reaching an Israeli checkpoint during a protest against the Israeli police raid on Jerusalem's al-Aqsa mosque on Tuesday, in the occupied West Bank city of Bethlehem September 18, 2015. Israel deployed hundreds of extra police around the Old City of Jerusalem on Friday after Palestinian leaders called for a 'day of rage' to protest at new Israeli security measures. REUTERS/Luke Baker 

Israeli policemen prevent a Palestinian woman from entering the compound which houses al-Aqsa mosque, known by Muslims as the Noble Sanctuary and by Jews as the Temple Mount, in Jerusalem's Old City September 14, 2015. Israeli police raided the plaza outside Jerusalem's al-Aqsa mosque on Sunday in what they said was a bid to head off Palestinian attempts to disrupt visits by Jews and foreign tourists on the eve of the Jewish New Year. REUTERS/Ammar Awad

A security official of German rail operator Deutsche Bahn (DB) prevents migrants to disembark from their train at the main railway station in Frankfurt, Germany, September 13, 2015. REUTERS/Kai Pfaffenbach

A security official of German rail operator Deutsche Bahn (DB) prevents migrants to disembark from their train at the main railway station in Frankfurt, Germany, September 13, 2015. REUTERS/Kai Pfaffenbach

A protester is restrained after fighting with police as protests moved into the street on the first day of pretrial motions for six police officers charged in connection with the death of Freddie Gray in Baltimore, Maryland September 2, 2015. Baltimore City Circuit Court Judge Barry Williams on Wednesday rejected defense motions to drop charges against six police officers in the case of a black man who died in April from injuries in police custody. REUTERS/Bryan Woolston 

A protester is restrained after fighting with police as protests moved into the street on the first day of pretrial motions for six police officers charged in connection with the death of Freddie Gray in Baltimore, Maryland September 2, 2015. Baltimore City Circuit Court Judge Barry Williams on Wednesday rejected defense motions to drop charges against six police officers in the case of a black man who died in April from injuries in police custody. REUTERS/Bryan Woolston 

A protester is restrained after fighting with police as protests moved into the street on the first day of pretrial motions for six police officers charged in connection with the death of Freddie Gray in Baltimore, Maryland September 2, 2015. Baltimore City Circuit Court Judge Barry Williams on Wednesday rejected defense motions to drop charges against six police officers in the case of a black man who died in April from injuries in police custody. REUTERS/Bryan Woolston 

A protester is restrained after fighting with police as protests moved into the street on the first day of pretrial motions for six police officers charged in connection with the death of Freddie Gray in Baltimore, Maryland September 2, 2015. Baltimore City Circuit Court Judge Barry Williams on Wednesday rejected defense motions to drop charges against six police officers in the case of a black man who died in April from injuries in police custody. REUTERS/Bryan Woolston 

A protester is restrained after fighting with police as protests moved into the street on the first day of pretrial motions for six police officers charged in connection with the death of Freddie Gray in Baltimore, Maryland September 2, 2015. Baltimore City Circuit Court Judge Barry Williams on Wednesday rejected defense motions to drop charges against six police officers in the case of a black man who died in April from injuries in police custody. REUTERS/Bryan Woolston 

A protester is restrained by supporters of Republican presidential candidate and Governor of Wisconsin Scott Walker as walkers speaks at the Iowa State Fair in Des Moines, Iowa August 17, 2015. REUTERS/Joshua Lott 

A young Jewish settler is held back by Israeli police near buildings slated for demolition by order of Israel's high court, in the West Bank Jewish settlement of Beit El near Ramallah July 28, 2015. Israeli police said on Tuesday that forces were deployed to the settlement in the occupied West Bank in order to prevent people from barricading themselves inside the structures known as the "Drainhoff" buildings. REUTERS/Baz Ratner

Lebanese parliament member Hikmat Deeb tries to stop a Lebanese army soldier during a scuffle with members of the Free Patriotic Movement, who have been blocked by the army, as they protest towards the government palace in Beirut, Lebanon July 9, 2015. Hundreds of supporters of a Lebanese Christian politician protested in Beirut on Thursday against the Sunni prime minister they claim is marginalizing Christian influence, stirring tensions in a country in crisis over war in neighboring Syria. Michel Aoun accuses Prime Minister Tammam Salam of taking decisions without cross-party consensus and usurping powers reserved for the president - a post set aside for a Christian but vacant since last year due to the wider political crisis. REUTERS/Mohamed Azakir TPX IMAGES OF THE DAY

A Lipizzaner stallion performs during a rehearsal for the 450 years anniversary show of the Spanish Riding School in Vienna, Austria, June 24, 2015. REUTERS/Heinz-Peter Bader 

A couple wearing masks to prevent contracting Middle East Respiratory Syndrome (MERS) rides a tandem bicycle at the Han river park in Seoul, South Korea, June 22, 2015. South Korea's health ministry reported on Monday two more deaths in the country's Middle East Respiratory Syndrome (MERS) outbreak, bringing the number of fatalities to 27. REUTERS/Kim Hong-Ji 

Police detain a member of the National Students' Union of India (NSUI), the student wing of India's opposition Congress party, during a protest against India’s Foreign Minister Sushma Swaraj, in New Delhi, India, June 16, 2015. India's main opposition party led calls on Monday for the resignation of the foreign minister over allegations she tried to help the former chief of India's richest sports league obtain British travel documents. Indian media reported on Sunday that Sushma Swaraj had last year asked British authorities to examine a request to provide travel documents to Lalit Modi, at a time when his passport had been revoked by Indian authorities in a graft case. REUTERS/Adnan Abidi 

A woman wearing a mask to prevent contracting Middle East Respiratory Syndrome (MERS) walks at Myeongdong shopping district in central Seoul, South Korea, June 11, 2015. An outbreak of Middle East Respiratory Syndrome (MERS) forced South Korea to cut interest rates on Thursday in the hope of softening the blow to an economy already burdened by slack demand, as authorities reported 14 new cases. REUTERS/Kim Hong-Ji 

A young man reacts after pulling a ticket out from a plastic bucket during an army draft held at a school in Klong Toey, the dockside slum area in Bangkok April 5, 2015. Thai men over 21 must serve in the army. Those who volunteer serve six months, but others choose the annual lottery, which goes on for 10 days in recruitment centres around Thailand. REUTERS/Athit Perawongmetha 

Football - Liverpool v Besiktas - UEFA Europa League Second Round First Leg - Anfield, Liverpool, England - 19/2/15
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A handler stands with a Beagle in the "doggie potty" area in the basement of the Pennsylvania Hotel in New York City ahead of the139th Westminster Kennel Club's Annual Dog Show in the Manhattan borough of New York February 15, 2015. REUTERS/Mike Segar (UNITED STATES - Tags: SOCIETY ANIMALS) 

A dog has its photo taken during a New York Pet Fashion Show event during Fashion Week in the Manhattan borough of New York February 12, 2015. REUTERS/Carlo Allegri (UNITED STATES - Tags: FASHION SOCIETY ANIMALS) 

Prospective flight attendants practise restraining techniques during a self-defence course for crew members at the Indigo Airlines' Ifly training center in Gurgaon on the outskirts of New Delhi November 18, 2014. Picture taken November 18, 2014. REUTERS/Adnan Abidi (INDIA - Tags: BUSINESS TRANSPORT) 

Cowboys Wyatt Williams and David Thompson restrain a calf as Stetson Mackey prepares to give it medicine near Ignacio, Colorado June 12, 2014. The land where the cattle graze is leased from the Forest Service by third-generation rancher Steve Pargin. Several times a year, he and a crew led by his head cowboy, David Thompson, spend a week or more herding cattle from mountain range to mountain range to prevent them from causing damage to fragile ecosystems by staying in a single area too long. Picture taken June 12, 2014. REUTERS/Lucas Jackson (UNITED STATES - Tags: AGRICULTURE ANIMALS ENVIRONMENT BUSINESS)

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Cowboys Wyatt Williams (R) and David Thompson work to restrain a calf in order to give it medicine near Ignacio, Colorado June 12, 2014. The land where the cattle graze is leased from the Forest Service by third-generation rancher Steve Pargin. Several times a year, he and a crew led by his head cowboy, David Thompson, spend a week or more herding cattle from mountain range to mountain range to prevent them from causing damage to fragile ecosystems by staying in a single area too long. Picture taken June 12, 2014. REUTERS/Lucas Jackson (UNITED STATES - Tags: ANIMALS AGRICULTURE ENVIRONMENT BUSINESS TPX IMAGES OF THE DAY)

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A devotee in a state of trance is calmed by volunteers during the annual Magic Tattoo Festival at Wat Bang Phra in Nakhon Prathom province March 15, 2014. Believers from across Thailand travel to the monastery to have their bodies adorned with tattoos and to pay their respects to the temple's master tattooist. They believe the tattoos have mystical powers, ward off bad luck and protect them from harm. REUTERS/Athit Perawongmetha (THAILAND - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY) 

Police officers clash with supporters of the native Indian community during a protest outside the Indian museum, next to the Maracana stadium, in Rio de Janeiro, December 16, 2013. Police arrested more than 20 indigenous people who occupied the abandoned museum on Sunday as a protest agaisnt its demolition, as part of renovations ahead of Brazil's 2014 World Cup, according to local media. REUTERS/Pilar Olivares (BRAZIL - Tags: POLITICS SPORT SOCCER WORLD CUP BUSINESS CONSTRUCTION CIVIL UNREST TPX IMAGES OF THE DAY) 

Israeli border police officers detain an ultra-Orthodox Jewish protester during clashes at a construction site in the town of Beit Shemesh, near Jerusalem November 14, 2013. Some 300 ultra-Orthodox protesters on Thursday demonstrated against digging in the site they believe contains ancient Jewish graves. An Israeli police spokesperson said 8 protesters were detained for questioning and were later released. REUTERS/Ammar Awad (ISRAEL - Tags: RELIGION CIVIL UNREST BUSINESS CONSTRUCTION TPX IMAGES OF THE DAY) 

Police detain a supporter of Chandrababu Naidu, chief of Telugu Desam Party (TDP), a regional party, as he tries to stop a vehicle from carrying Naidu to a hospital in New Delhi October 11, 2013. Naidu was on an indefinite hunger strike since Monday against the creation of Telangana state, according to local media. Two Indian ministers resigned last week over a cabinet decision to create the new state out of the southern Indian state of Andhra Pradesh, a growing hub for Western IT giants. REUTERS/Mansi Thapliyal (INDIA - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A barricade leading to the Lincoln Memorial prevents access to tourist buses in Washington, October 1, 2013. The U.S. government began a partial shutdown on Tuesday for the first time in 17 years, potentially putting up to 1 million workers on unpaid leave, closing national parks and stalling medical research projects. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS BUSINESS TPX IMAGES OF THE DAY) 

Police detain a demonstrator during a protest at the entrance of a drill site run by Cuadrilla Resources, in the village of Balcombe in southern England September 3, 2013. Caudrilla Resources's site in the village of Balcombe in rural West Sussex has become a focal point for protesters who oppose fracking, a technique the company has pioneered in the search for shale gas in Britain. REUTERS/Luke MacGregor (BRITAIN - Tags: BUSINESS ENERGY POLITICS ENVIRONMENT CRIME LAW) 

Military police clash with demonstrators from the group called Black Bloc during a protest against Sao Paulo State Governor Geraldo Alckmin, in Sao Paulo August 1, 2013. REUTERS/Nacho Doce (BRAZIL - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A Cheetah cub is examined by veterinary staff during a health check in its enclosure at Chester Zoo in northern England July 31, 2013. The eight week old cub, along with its sibling and two Cheetah cubs, were weighed, sexed and vaccinated on Wednesday for the first time since their birth. REUTERS/Phil Noble (BRITAIN - Tags: ENVIRONMENT SOCIETY ANIMALS) 

A demonstrator is detained during a clash with riot policemen during a national strike in Santiago July 11, 2013. Students, workers and citizens staged a 24-hour national strike demanding reforms in the public state education system , improvements in salaries and health care, according to local media. REUTERS/Carlos Vera (CHILE - Tags: POLITICS CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY BUSINESS EMPLOYMENT) 

A youth supporting the National Union for the Elderly (UNAM) is detained during clashes with police officers during the fourth day of protest in front of the Nicaraguan Social Security Institute in Managua June 20, 2013. Senior citizens held the protest to demand a minimum pension of $90, and to reject the government's proposed social security reforms. REUTERS/Oswaldo Rivas (NICARAGUA - Tags: CIVIL UNREST POLITICS) 

A young man supporting the National Union for the Elderly (UNAM) is detained during clashes with police officers during the fourth day of protests in front of the Nicaraguan Social Security Institute in Managua June 20, 2013. Senior citizens held the protest to demand a minimum pension of $90, and to reject the government's proposed social security reforms. REUTERS/Oswaldo Rivas (NICARAGUA - Tags: CIVIL UNREST POLITICS TPX IMAGES OF THE DAY) 

Afghan security forces escort a captured suspected Taliban insurgent during an operation in Sorkhrod district of Jalalabad province, June 19, 2013. Police officers captured two suspected Taliban insurgents and killed four others during the overnight ambush, according to deputy provincial police chief Masoon Khan Hashimi. REUTERS/Parwiz (AFGHANISTAN - Tags: CIVIL UNREST)