London — Oil prices slipped on Tuesday amid rising Covid-19 cases and a possible return of Libyan oil production, which has been down to a trickle since the start of the year.

The more-active September contract for Brent fell 22c, or 0.5%, to $41.63 a barrel by 8.32am GMT, paring Monday’s 92c gain. The August contract, which expires on Tuesday, fell 26c to $41.45...

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