Oil gains could be hit by uncertainty, Goldman Sachs and Morgan Stanley warn

Lights illuminate the phosphate processing plant as a flame burns from a chimney at the Ras Al Khair Industrial City, operated by the Saudi Arabian Mining Co. (Ma'aden) in Ras Al Khair, Saudi Arabia, on Wednesday, Nov. 23, 2016. Photographer: Simon Dawson/Bloomberg
Lights illuminate the phosphate processing plant as a flame burns from a chimney at the Ras Al Khair Industrial City, operated by the Saudi Arabian Mining Co. (Ma'aden) in Ras Al Khair, Saudi Arabia, on Wednesday, Nov. 23, 2016. Photographer: Simon Dawson/Bloomberg

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