(FILES) This file photo taken on August 13, 2016 shows shoppers walking past a Debenhams department store on Oxford Street in central London. From computers and cars to carpets and food, Britain's decision to leave the EU is beginning to hit consumers in the pocket, having already spread uncertainty through the property market. Price comparison website mysupermarket.com has already reported an increase of one percent in the price of an average basket of supermarket goods in July, blaming "fears of Brexit" for the second consecutive month of price hikes. / AFP PHOTO / NIKLAS HALLE'NNIKLAS HALLE'N/AFP/Getty Images

(FILES) This file photo taken on August 13, 2016 shows shoppers walking past a branch of retailer Next on Oxford Street in central London. From computers and cars to carpets and food, Britain's decision to leave the EU is beginning to hit consumers in the pocket, having already spread uncertainty through the property market. Price comparison website mysupermarket.com has already reported an increase of one percent in the price of an average basket of supermarket goods in July, blaming "fears of Brexit" for the second consecutive month of price hikes. / AFP PHOTO / NIKLAS HALLE'NNIKLAS HALLE'N/AFP/Getty Images

(FILES) This file photo taken on August 13, 2016 shows shoppers walking past a branch of clothing retailer Topshop on Oxford Street in centarl London. From computers and cars to carpets and food, Britain's decision to leave the EU is beginning to hit consumers in the pocket, having already spread uncertainty through the property market. Price comparison website mysupermarket.com has already reported an increase of one percent in the price of an average basket of supermarket goods in July, blaming "fears of Brexit" for the second consecutive month of price hikes. / AFP PHOTO / NIKLAS HALLE'NNIKLAS HALLE'N/AFP/Getty Images

This image released by NASA August 16, 2016 shows Lake Powell and the border of Utah and Arizona, captured by the remotely controlled Sally Ride EarthKAM aboard the International Space Station on July 14, 2016. Located on the Colorado River, Lake Powell is the second largest artificial reservoir in the United States. The EarthKAM program allows students to request photographs of specific Earth features, which are taken by a special camera mounted on the space station when it passes over those features. The images are posted online for the public and students in participating classrooms around the world to view. EarthKAM is the only program providing students with such direct control of an instrument on a spacecraft orbiting Earth, teaching them about environmental science, geography and space communications. The project was initiated by Dr. Sally Ride, Americas first woman in space, in 1995 and called KidSat; the camera flew on five space shuttle flights before moving to the space station on Expedition 1 in 2001. / AFP PHOTO / NASA/EarthKAM.org / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA / EarthKAMM.org" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/Getty Images

CORRECTION - Japan's Mima Ito (R) and teammate Japan's Ai Fukuhara look at a tablet computer as another team member Japan's Kasumi Ishikawa plays against Germany's Han Ying in the women's team semi-final table tennis match at the Riocentro venue during the Rio 2016 Olympic Games in Rio de Janeiro on August 14, 2016. / AFP PHOTO / Juan Mabromata / The erroneous mention[s] appearing in the metadata of this photo by Juan Mabromata has been modified in AFP systems in the following manner: [Ai Fukuhara ] instead of [Jun Mizutani]. Please immediately remove the erroneous mention[s] from all your online services and delete it (them) from your servers. If you have been authorized by AFP to distribute it (them) to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require.JUAN MABROMATA/AFP/Getty Images

A magnifying glass is held in front of a computer screen in this picture illustration taken in Berlin May 21, 2013. REUTERS/Pawel Kopczynski/File Photo

Workers set a fence around the area on the 65th kilometer of the railway track Wroclaw-Walbrzych, during preparations to explore the existence of the so-called 'Nazi Gold train', in Walbrzych, Poland, on August 12, 2016. Piotr Koper and Andreas Richter, who reported finding the so-called 'Nazi Gold train" in August 2015, will start the final excavation of the train on August 16, 2016. In December 2015 two independent studies were conducted by AGH University of Science scientists and by Koper and Richter. AGH University of Science scientists claim the tunnel may exist, but have found no evidence of so-called 'Nazi Gold Train' in it. The second report, by Koper and Richter, claims there are some anomalies in the soil possibly indicating the existence of a train. / AFP PHOTO / PAP / ALEKSANDER KOZMINSKIALEKSANDER KOZMINSKI/AFP/Getty Images

Departure boards show some Delta flights as cancelled flights after Delta Air Lines' computer systems crashed on Monday, grounding flights around the globe, at Hartsfield Jackson Atlanta International Airport in Atlanta, Georgia, U.S. August 8, 2016. REUTERS/Tami Chappell - RTSLUJF