Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's coach Rui Vitoria and Dynamo Kyiv's coach Serhiy Rebrov during the match. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's players shake hands with Dynamo Kyiv's players after the game. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Guillermo Celis, Pizzi and Alex Grimaldo celebrate after the game. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's coach Serhiy Rebrov and Benfica's coach Rui Vitoria during the match. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Goncalo Guedes and Dynamo Kyiv's Nikita Korzun in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's Yevhen Khacheridi and Benfica's Kostas Mitroglou in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16.Dynamo Kyiv's Valeriy Fedorchuk and Benfica's Eduardo Salvio in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's goalkeeper Artur Rudko fails to save a shot by Benfica's Franco Cervi. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Franco Cervi celebrates with his team mates after scoring a goal. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's Domagoj Vida and Benfica's goalkeeper Ederson in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Ljubomir Fejsa and Kostas Mitroglou in action with Dynamo Kyiv's Junior Moraes and Domagoj Vida. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Lisandro Lopez and Dynamo Kyiv's Danilo Silva in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Kostas Mitroglou and Dynamo Kyiv's Nikita Korzun in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Benfica's Alex Grimaldo and Dynamo Kyiv's Andriy Yarmolenko in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's Andriy Yarmolenko in action with Benfica's Ljubomir Fejsa and Alex Grimaldo. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's Serhiy Sydorchuk and Benfica's Ljubomir Fejsa in action. REUTERS/Valentyn Ogirenko 

Football Soccer - FC Dynamo Kyiv v SL Benfica - Champions League - Group B - NSC Olimpiyskiy Stadium, Kiev, Ukraine - 19/10/16. Dynamo Kyiv's Serhiy Sydorchuk in action with Benfica's Alex Grimaldo and Goncalo Guedes. REUTERS/Valentyn Ogirenko 

People take pictures as the SLS five-segment Solid Rocket Motor undergoes a static test fire at the Orbital ATK facility in Promontory, Utah March 11, 2015. A beefed-up space shuttle solid rocket motor passed a two-minute test firing in Utah on Wednesday, a key milestone toward the debut flight of NASA's deep-space launcher in 2018, the U.S. space agency said. REUTERS/Jim Urquhart (UNITED STATES - Tags: SCIENCE TECHNOLOGY) 

Adama Tarawallie reacts near her husband Ibrahim, 31, a suspected Ebola victim, as they wait to be transported from Devils Hole North, west of Freetown, Sierra Leone, December 17, 2014.
The death toll in the Ebola epidemic has risen to 6,915 out of 18,603 cases as of Dec. 14, the World Health Organization (WHO) said on Wednesday. There are signs that the increase in incidence in Sierra Leone has slowed, although 327 new cases were confirmed there in the past week, including 125 in the capital Freetown, the WHO said in its latest update. REUTERS/Baz Ratner (SIERRA LEONE - Tags: HEALTH POLITICS DISASTER TPX IMAGES OF THE DAY) 

A Sierra Leonean soldier walks pest protective clothing drying on a fence in the Ebola Training Academy in Freetown, Sierra Leone, December 16, 2014.
REUTERS/Baz Ratner (SIERRA LEONE - Tags: HEALTH MILITARY DISASTER) 

German professional racecar driver Nico Bastian sits in a Mercedes SLS sport car on the pit lane during the international presentation of the new Sony PlayStation "Gran Turismo 6" video game at Ascari Race circuit in Ronda, southern Spain, December 3, 2013. One of Ronda's most high-profile streets was named after Kazunori Yamauchi, Gran Turismo creator, yesterday. The surroundings of Ronda will be available in one of the game's functions, incorporating stunning Andalusian scenery and the nearby Ascari Race Resort, an exclusive, private race circuit. REUTERS/Jon Nazca (SPAIN - Tags: BUSINESS SOCIETY SPORT MOTORSPORT) 

SL Benfica's Andre Almeida (L) and Melgarejo celebrate having saved a goal in the final minutes of their Europa League soccer match against Bayer Leverkusen in Leverkusen February 14, 2013. REUTERS/Wolfgang Rattay (GERMANY - Tags: SPORT SOCCER) 

Police try and clear a path through demonstrators who gathered to protest against the visit of former U.S. Vice President Dick Cheney outside the Vancouver Club in Vancouver, British Columbia September 26, 2011. Cheney was in town to promote his new memoir. REUTERS/Andy Clark (CANADA - Tags: CIVIL UNREST POLITICS TPX IMAGES OF THE DAY) 

Home plate umpire Paul Schrieber (R) looks on as New York Yankees' catcher Russell Martin (L) holds the ball aloft after tagging out Tampa Bay Rays' Evan Longoria who was trying to score from third base on a run down with Rays' Johnny Damon during the third inning of their American League MLB baseball game in St. Petersburg, Florida September 26, 2011. REUTERS/Steve Nesius (UNITED STATES - Tags: SPORT BASEBALL TPX IMAGES OF THE DAY) 

U.S. President Barack Obama (C) arrives at Marine Corps Air Station Miramar near San Diego, California September 26, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS) 

A survey crew works on a road project in The Presidio in San Francisco, California September 26, 2011. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS CONSTRUCTION TPX IMAGES OF THE DAY) 

Anti-Gaddafi fighters take cover to return fire as pro-Gaddafi forces fired heavy artillery upon them, around 4 km (3 miles) east of Sirte, September 26, 2011. REUTERS/Asmaa Waguih (LIBYA - Tags: POLITICS CIVIL UNREST CONFLICT) 

A Chinook helicopter used by Libya's interim government to transport injured people takes off from a field hospital set up about 50 km (31 miles) west of Muammar Gaddafi's hometown of Sirte, September 26, 2011. REUTERS/Anis Mili (LIBYA - Tags: CONFLICT) 

Visitors wait to tour "Chip", a home designed by The Southern California Institute of Architecture and California Institute of Technology, for the Solar Decathlon in Washington September 26, 2011. The U.S. Department of Energy Solar Decathlon is a competition that challenges collegiate teams to design, build, and operate solar-powered houses that are cost-effective, energy-efficient, and attractive. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS EDUCATION ENERGY ENVIRONMENT SOCIETY BUSINESS) 

EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.

A boy smiles as he plays on a tank at a war exhibition held by Iran's revolutionary guard to mark the anniversary of the Iran-Iraq war (1980-88), also known in Iran as the "Holy Defence", in southern Tehran September 26, 2011. REUTERS/Morteza Nikoubazl (IRAN - Tags: POLITICS MILITARY ANNIVERSARY TPX IMAGES OF THE DAY) 

High school students are hit by a jet of water as they dance during a rally against the closing of their schools at the Providencia neighborhood in Santiago city September 26, 2011. Providencia's Mayor, on Friday, ordered the end of the school year, the closing of local schools, and cancelled the admission of students taking part in the movement. The students are demanding for free and better state education, as well as for an end to profit-making in the public education system. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST BUSINESS EMPLOYMENT EDUCATION) 

Riot policemen clash with high school students during a rally against the closing of their schools at the Providencia neighborhood in Santiago city September 26, 2011. Providencia's Mayor, on Friday, ordered the end of the school year, the closing of local schools, and cancelled the admission of students taking part in the movement. The students are demanding for free and better state education, as well as for an end to profit-making in the public education system. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST BUSINESS EMPLOYMENT EDUCATION) 

Morning commuters walk past protesters of the Occupy Wall Street campaign sleeping in Zuccotti Park, near Wall Street in New York September 26, 2011. Protesters complaining about the power of the financial industry staged noisy demonstrations and slowed pedestrian traffic on Wall Street for a second week. The Occupy Wall Street campaign started a week earlier when several hundred people set up camp in downtown Manhattan. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS CIVIL UNREST) 

A detained opposition activist shouts in a police van during a protest outside the Election Commission headquarters in Moscow September 26, 2011. Dozens of people gathered to show their intention to boycott forthcoming elections, local media reported. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS CIVIL UNREST) 

An anti-Gaddafi fighter gestures after firing a cannon during a battle with Gaddafi loyalists near Sirte, September 26, 2011. REUTERS/Goran Tomasevic (LIBYA - Tags: CIVIL UNREST) 

A native Bolivian from the Isiboro Secure indigenous territory and national park, known by its Spanish acronym TIPNIS, clashes with police as he and dozens of others break away from police custody to block the airport runway as they were being forced to board a plane and return towards their homeland in Rurrenbaque September 26, 2011. The natives were in the middle of a 370-mile (595-km) protest march from Trinidad in the northern lowlands to the government seat in La Paz, against a projected 185-mile (298-km) long highway that bisects the TIPNIS, when President Evo Morales ordered police to intervene and stop the march on Sunday. A large group of dozens of protesters managed on Monday to break away from police custody at Rurrenbaque airport and block the runway with burning wood and tires as they repelled attempts by the police to contain them. REUTERS/David Mercado (BOLIVIA - Tags: POLITICS CIVIL UNREST ENVIRONMENT) 

U.S. soldiers from Task Force "No Fear", Alpha Company, 2-27 Infantry "The Wolfhounds", fire a 120mm mortar at a Taliban position from Combat Outpost (COP) Pirtle King in Ghaziabad district, Kunar province, eastern Afghanistan September 26, 2011. REUTERS/Erik De Castro (AFGHANISTAN - Tags: MILITARY CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

Anti-Gaddafi fighters drive tanks towards the frontline at Wadi Dinar gate, near the city of Bani Walid, about 170 km (105 miles) southeast of Tripoli September 26, 2011. A month after ousting Gaddafi's forces from Tripoli and most of the country, the challenge to the NTC's rule is now focused in Sirte and Bani Walid. REUTERS/Youssef Boudlal (LIBYA - Tags: POLITICS MILITARY CONFLICT CIVIL UNREST TPX IMAGES OF THE DAY) 

An inflatable pink pig flies above Battersea Power Station in London September 26, 2011. A large inflatable pig flew above London's Battersea Power Station on Monday in a stunt designed to mark the re-issue of British band Pink Floyd's 14 studio albums by record label EMI Music. The animal, measuring 30 feet long and 15 feet high, was inflated with helium at dawn for the event, held 35 years after the making of the iconic album cover for "Animals" featuring a similar flying pig. REUTERS/Paul Hackett (BRITAIN - Tags: SOCIETY ENTERTAINMENT) 

A vendor demonstrates opening a traditional Matryoshka doll or Russian nesting doll, bearing the faces of Russian Prime Minister Vladimir Putin (underneath) and President Dmitry Medvedev at a souvenir market in St. Petersburg September 26, 2011. Opinion polls indicate that Putin, who said on Saturday he would seek a return to the presidency after nearly four years as prime minister, is much more popular than his potential rivals and all but certain to win next March's presidential election. REUTERS/Alexander Demianchuk (RUSSIA - Tags: SOCIETY POLITICS ELECTIONS) 

Amanda Knox, the U.S. student convicted of murdering her British flatmate Meredith Kercher in Italy in November 2007, reacts in court during her appeal trial session in Perugia September 26, 2011. Knox is appealing against a 26-year jail term imposed after she was found guilty of murdering Kercher with the help of her Italian boyfriend and another man during a drug-fuelled orgy. Prosecutors have asked the appeals court to extend her sentence to life in jail. REUTERS/Alessandro Bianchi (ITALY - Tags: CRIME LAW) 

A defected soldier backing anti-government protesters salutes through a tear in a huge Yemeni flag during a rally to demand the ouster of President Ali Abdullah Saleh in Sanaa September 26, 2011.REUTERS/Ahmed Jadallah (YEMEN - Tags: POLITICS CIVIL UNREST) 

A model displays a creation as part of DSquared 2 Spring/Summer 2012 women's collection during Milan Fashion Week September 26, 2011. REUTERS/Stefano Rellandini (ITALY - Tags: FASHION) 

Namibia's Heinz Koll (C) and Hugo Horn tackle Wales captain Sam Warburton (L) during their Rugby World Cup Pool D match at Stadium Taranaki in New Plymouth September 26, 2011. REUTERS/Nigel Marple (NEW ZEALAND - Tags: SPORT RUGBY) 

Students look out from a school bus as they go home after the suspension of classes due to rainfall from Typhoon Nesat in Quezon City, Metro Manila September 26, 2011. The Department of Education suspended afternoon classes in the preschool, elementary and high school levels of both private and public schools in Metro Manila due to Typhoon Nesat, which is locally known as Tropical Storm Pedring, according to local media reports. REUTERS/Cheryl Ravelo (PHILIPPINES - Tags: SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY) 

A dog rides a wave at a surf dog contest in Huntington Beach, California September 25, 2011. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT SOCIETY ANIMALS) 

A dog rides a wave at a surf dog contest in Huntington Beach, California September 25, 2011. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT SOCIETY ANIMALS) 

Workers close the door of the Monumental bullring for the last time after the last bullfight in central Barcelona September 25, 2011. Fans and opponents of bullfighting crowded into Barcelona on Sunday for the last "corrida" to be held in the city's La Monumental arena following a ban on the traditional Spanish spectacle in Catalonia REUTERS/Gustau Nacarino (SPAIN - Tags: SOCIETY) 

A dog poses on a board at a surf dog contest in Huntington Beach, California September 25, 2011. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT SOCIETY ANIMALS TPX IMAGES OF THE DAY) 

San Diego Chargers cheerleaders perform during a break in the NFL football game between the San Diego Chargers and the Kansas City Chiefs in San Diego, September 25, 2011. REUTERS/Mike Blake (UNITED STATES - Tags: SPORT FOOTBALL ENTERTAINMENT SOCIETY) 

Boston Red Sox catcher Jason Varitek reacts after he made a throwing error to third base that allowed New York Yankees batter Mark Teixeira to score in the first inning of the second MLB American League baseball game of a day/night doubleheader at Yankee Stadium in New York, September 25, 2011. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASEBALL) 

The last bull to be killed during the last bullfight is removed from the arena at La Monumental bullring in central Barcelona September 25, 2011. Fans and opponents of bullfighting crowded into Barcelona on Sunday for the last "corrida" to be held in the city's La Monumental arena following a ban on the traditional Spanish spectacle in Catalonia REUTERS/Gustau Nacarino(SPAIN - Tags: SOCIETY) 

Workers dismantle the safety barricades after the Singapore F1 Grand Prix in Singapore September 26, 2011. REUTERS/Timothy Sim (SINGAPORE - Tags: SPORT MOTORSPORT BUSINESS EMPLOYMENT TPX IMAGES OF THE DAY) 

Protesters argue with riot police during a rally against the government's new austerity measures in Athens 25, 2011. Greek riot police fired teargas at anti-austerity protesters pelting them with bottles outside parliament on Sunday in the first such unrest after a summer lull. REUTERS/John Kolesidis (GREECE - Tags: CIVIL UNREST POLITICS BUSINESS) 

Anti-government protesters shout slogans during a demonstration to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa September 25, 2011. Yemeni soldiers killed two tribal fighters and wounded 18 anti-government protesters on Sunday in the latest clashes in a week of bloodshed that has raised fears of a descent into all-out civil war. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Kawasaki rider Gregory Leblanc of France celebrates after crossing the finish line in first position during the 34th Le Mans 24-hour motorcycle endurance race in Le Mans, western France, September 25, 2011. The Kawasaki number 11 is also ridden by Julien Da Costa and Olivier Four of France. REUTERS/Stephane Mahe (FRANCE - Tags: SPORT MOTORSPORT TPX IMAGES OF THE DAY) 

A local television reporter holds a handout picture released by the Indonesian police, showing a dead suspected suicide bomber, to residents and journalists after an explosion in front of a church in Solo, Central Java September 25, 2011. A suspected suicide bomber attacked a church on Indonesia's Java island on Sunday, killing himself and injuring 17 people, police said. The police is appealing for information to identify the suspect via the handout picture. REUTERS/Andry Prasetyo (INDONESIA - Tags: CRIME LAW CIVIL UNREST MEDIA RELIGION TPX IMAGES OF THE DAY) 

Women in traditional Russian costumes stand behind sculptures displaying the Soviet State founder Vladimir Lenin (3d L) and his followers during the 1st Slavic Museum Night festival at the Museum of Modern Art in Russia's Siberian city of Krasnoyarsk September 24, 2011. The aim of the festival is to preserve the heritage of Slavic culture and revive traditions, according to organizers. Picture taken September 24, 2011. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

A teenager working part-time inside the U.S. military's Combat Outpost (COP) Pirtle King tries the dumbbells at the base gym, in Ghaziabad district, Kunar province, eastern Afghanistan September 25, 2011. REUTERS/Erik De Castro (AFGHANISTAN - Tags: MILITARY CIVIL UNREST CONFLICT SOCIETY)