TO GO WITH AFP STORY BY CELIA LEBUR (FILES) This file photo taken on August 12, 2016 shows Gabonese President Ali Bongo Ondimba gesturing as he speaks to journalists during an interview in Libreville. To modernize an oil rent economy out of breath, Gabonese President Ali Bongo Ondimba launched an ambitious diversification plan based on large projects. Often attributed to Asian groups, they would have had only a "superficial effect" according to his opponents. / AFP PHOTO / STEVE JORDANSTEVE JORDAN/AFP/Getty Images

People pass the skyline of Singapore's central business district shrouded by haze August 26, 2016. REUTERS/Edgar Su

People pass the skyline of Singapore's central business district shrouded by haze August 26, 2016. REUTERS/Edgar Su

A man covers his face with a mask as haze shrouds Singapore's central business district August 26, 2016. REUTERS/Edgar Su

A man covers his face with a mask as haze shrouds Singapore's central business district August 26, 2016. REUTERS/Edgar Su

Women cover their faces with masks as haze shrouds Singapore's central business district August 26, 2016. REUTERS/Edgar Su

South Korean hospital officials carry the body of Lee In-Won, vice chairman of South Korea's Lotte Group, who was found hanging from a tree near a hiking trail in the eastern town of Yangpyeong on August 26, 2016. The vice chairman of South Korea's troubled Lotte Group was found dead on August 26, police said, in an apparent suicide amid a widening corruption probe into the country's fifth largest business conglomerate. / AFP PHOTO / YONHAP / YONHAPYONHAP/AFP/Getty Images

This picture taken by Yonhap news agency on December 1, 2015 shows Lee In-Won, vice chairman of South Korea's Lotte Group, speaking at a kimchi event in Seoul. The vice chairman of South Korea's troubled Lotte Group was found dead on August 26, police said, in an apparent suicide amid a widening corruption probe into the country's fifth largest business conglomerate. / AFP PHOTO / YONHAP / YONHAPYONHAP/AFP/Getty Images