File photo of Fiji's coach Ben Ryan (R) hugging Samisoni Viriviri after losing to England in the Cup semi-final at the Hong Kong Sevens rugby tournament, as part of the Sevens World Series, in Hong Kong March 30, 2014. REUTERS/Tyrone Siu

A man walks past a truck in the truck production plant of German truck and bus-maker MAN AG in Munich, Germany July 30, 2015. REUTERS/Michaela Rehle

Shoppers walk in a Karstadt hot deal department store in Frankfurt/Oder October 24, 2014. REUTERS/Fabrizio Bensch

United Nations High Commissioner for Human Rights Zeid Ra'ad Al Hussein attends the 33rd session of the Human Rights Council at the U.N. European headquarters in Geneva, Switzerland, September 13, 2016. REUTERS/Denis Balibouse

Cambodia's Prime Minister Hun Sen (R) arrives to register for next year's local elections, in Kandal province, Cambodia September 1, 2016. REUTERS/Samrang Pring

Students throw stones during clashes with security at Johannesburg's University of the Witwatersrand. Demonstrations this year and in 2015 over the cost of university education -- prohibitive for many black students -- have highlighted frustration at the inequalities that persist more than two decades after the 1994 end of white minority rule. REUTERS/Siphiwe Sibeko

Rescue workers look for survivors after a ferry sank in the southern district of Barisal, Bangladesh, September 21, 2016. REUTERS/Stringer

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson