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Meanwhile, worries about a trade war between the US and China sent the price of Brent crude oil down more than 4%, following a fall of more than 10% last week.

That pipeline failure, which occurred under different ownership, spewed an estimated 140,000 gallons of crude oil, harmed hundreds of miles of coastline and cost millions to clean up.

Since 2000, certain African countries had duty-free access to the US market for a raft of goods including clothing and textiles, cocoa products and wine, as well as crude oil.

The US doesn't have a shortage of oil, but its refineries are designed to process so-called "heavier" - or thicker - crude oil, which mostly comes from Canada, with some from Mexico.

One local said some of the fish they caught released the pungent smell of crude oil as they were cooked.