A Gabonese voter checks the registry at a polling station in the Rio district during the Presidential Election on August 27, 2016 in Libreville. The people of Gabon began casting their ballots on August 27, 2016 in a vote to decide whether President Ali Bongo will remain in office or be unseated by a career diplomat and close associate of his late father, who ran the country for 41 years. The election takes place in a climate of persistent social unrest driven in large part by the economic impact of the slump in the price of oil, which has long dominated Gabon's economy. / AFP PHOTO / MARCO LONGARIMARCO LONGARI/AFP/Getty Images

Billionaire activist-investor Carl Icahn gives an interview on FOX Business Network's Neil Cavuto show in New York February 11, 2014. Icahn has backed off from his campaign urging Apple to increase its stock buybacks, citing the company's recent repurchases as well as an influential proxy adviser's call against his proposal. REUTERS/Brendan McDermid (UNITED STATES)

Rescuers of the Italian Red Cross and members of the Italian Guardia di Finanza (Financial Guard) stand in a square in the central Italian village of Amatrice on August 26, 2016, two days after a 6.2-magnitude earthquake struck the region killing some 267 people. The first funerals for victims of the devastating earthquake that hit central Italy this week were held on August 26, 2016 as the country prepared for an emotionally charged day of mourning. Flags will fly at half-mast across the country on August 27, 2016 in respect for the victims of a disaster that claimed at least 278 lives, according to an updated official toll. The Civil Protection agency's emergency unit said no new survivors had been found Friday in the remote mountain villages blitzed by Wednesday's powerful pre-dawn quake. At least 388 people have been hospitalised with injuries. No one has been pulled alive from the piles of collapsed masonry since Wednesday evening. / AFP PHOTO / ANDREAS SOLAROANDREAS SOLARO/AFP/Getty Images

Supporters of Zimbabwe's main opposition Movement For Democratic Change (MDC) take part in a march against what they say is the mishandling of the economy by President Robert Mugabe's government in Gweru, Zimbabwe, August 13, 2016. REUTERS/Philimon Bulawayo

Morgan Tsvangirai, leader of Zimbabwe's main opposition Movement For Democratic Change (MDC), addresses his supporters during a march against what they say is the mishandling of the economy by President Robert Mugabe's government in Gweru, August 13, 2016. REUTERS/Philimon Bulawayo

NEW YORK, NY - AUGUST 26: People take photos at the Wall Street Bull near the New York Stock Exchange (NYSE) on August 26, 2016 in New York City. Stocks fell on Friday after news that the U.S. economy grew at the sluggish rate of 1.1 percent. Despite the slowing growth rate Fed Chair Janet Yellen voiced optimism about the economy at the central bank's annual Jackson Hole summit. (Photo by Spencer Platt/Getty Images)

NEW YORK, NY - AUGUST 26: A man walks in front of a FedEx truck near the New York Stock Exchange (NYSE) on August 26, 2016 in New York City. Stocks fell on Friday after news that the U.S. economy grew at the sluggish rate of 1.1 percent. Despite the slowing growth rate Fed Chair Janet Yellen voiced optimism about the economy at the central bank's annual Jackson Hole summit. (Photo by Spencer Platt/Getty Images)

NEW YORK, NY - AUGUST 26: People take photos at the Wall Street Bull near the New York Stock Exchange (NYSE) on August 26, 2016 in New York City. Stocks fell on Friday after news that the U.S. economy grew at the sluggish rate of 1.1 percent. Despite the slowing growth rate Fed Chair Janet Yellen voiced optimism about the economy at the central bank's annual Jackson Hole summit. (Photo by Spencer Platt/Getty Images)