Police and army units patrol as the sun rises at the Hungary-Serbia border fence at Asotthalom, Hungary, September 1, 2016. REUTERS/Laszlo Balogh

The shape of a man is set in wire into the Hungary-Serbia border fence at Asotthalom, Hungary, September 2, 2016. REUTERS/Laszlo Balogh

The Sun rises at the Hungary-Serbia border fence at Asotthalom, Hungary, September 2, 2016. Picture taken September 2, 2016. REUTERS/Laszlo Balogh

A refugee woman washes clothes on the Hungary-Serbia border, on the Serbian side of a transit zone set up by Hungarian authorities to filter refugees at Roszke, Hungary, September 2, 2016. REUTERS/Laszlo Balogh

The company's new logo is pictured at the headquarters of LafargeHolcim in Zurich, Switzerland, July 15, 2015. REUTERS/Arnd Wiegmann/File Photo

Finance Minister Pravin Gordhan gestures during his address at a business summit in Sandton, South Africa, September 13, 2016. REUTERS/Siphiwe Sibeko

A view of Es Sider export terminal in Ras Lanuf, where a North Korean-flagged tanker had loaded crude oil, March 11, 2014. REUTERS/Esam Omran Al-Fetori

A Houthi militant stands on a wall in Sanaa, Yemen September 5, 2016. REUTERS/Khaled Abdullah