People walk past a souvenir shop in London, Britain September 18, 2016. REUTERS/Stefan Wermuth

People walk past a souvenir shop in London, Britain September 18, 2016. REUTERS/Stefan Wermuth

Souvenir mugs are seen outside a souvenir shop in London, Britain September 18, 2016. REUTERS/Stefan Wermuth

Executive Producers David Benioff, center left, and D.B. Weiss accept the award for Oustanding Drama Series for "Game of Thrones" with the cast and crew at the 68th Primetime Emmy Awards in Los Angeles, California, U.S., September 18, 2016. REUTERS/Mike Blake

A man uses a mobile phone in front of an advertisement board bearing the image of Pokemon Go at an electronic shop in Tokyo, Japan, July 27, 2016. REUTERS/Kim Kyung-Hoon/File Photo

International Atomic Energy Agency (IAEA) Director General Yukiya Amano smiles as he waits for a board of governors meeting to begin at the IAEA headquarters in Vienna, Austria June 6, 2016. REUTERS/Heinz-Peter Bader

Geeta, wife of Ravi Paul, an Indian army soldier who was killed in Sunday's attack at an Indian army base in Kashmir's Uri, mourns at her house in Sarwa village in Samba district, south of Jammu, September 19, 2016. REUTERS/Mukesh Gupta

Geeta (in yellow), wife of Ravi Paul, an Indian army soldier who was killed in Sunday's attack at an Indian army base in Kashmir's Uri, mourns at her house in Sarwa village in Samba district, south of Jammu, September 19, 2016. REUTERS/Mukesh Gupta