Penelope Miniati, head of the forensics science division works at the forensics science division of Hellenic Police in Athens, Greece, August 11, 2016. REUTERS/Michalis Karagiannis

A lab technician works at the forensics science division of Hellenic Police in Athens, Greece, August 11, 2016. REUTERS/Michalis Karagiannis

A man walks past a shop offering a summer sales and promotions in Liverpool, north west England on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images

A pedestrian walks past a shop offering a sale promotion in Liverpool, north west England, on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images

A pedestrian walks past a shop offering a sale promotion in Liverpool, north west England, on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images

Shoppers watch a street entertainer in Liverpool, north west England, on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images

A woman talks on a mobile phone outside a food shop offering a sale promotion in Liverpool, north west England, on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images

Pedestrians walk past a shop offering a sale promotion in Liverpool, north west England, on August 17, 2016. 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. The consequences of the shock vote have so far been mainly theoretical, but recent data suggest that the country's tumbling currency is about to reach the High Street. The Office for National Statistics publishes retail sales figures for July on August 18, 2016. / AFP PHOTO / PAUL ELLISPAUL ELLIS/AFP/Getty Images