Working oil pumps against a sunset sky.

Oil posted its worst day of the year on Friday, tumbling to the lowest level in more than two months as the new Covid-19 strain sparked fears about a demand slowdown just as supply increases.

The leg lower came amid a broad sell-off in the market with the Dow dropping more than 900 points. The World Health Organization warned Thursday of a new Covid variant detected in South Africa. It could be more resistant to vaccines thanks to its mutations, although the WHO said further investigation is needed.