BP PLC’s oil collection efforts dropped on Wednesday after spending much of the day reinstalling a containment cap on a leaking well in the Gulf of Mexico, the company said in a statement Thursday.

BP collected 16,830 barrels of oil, down nearly 40% from the day before. Earlier on Wednesday, a robot submarine collided with the containment cap, jostling it loose and forcing the company to halt the flow of oil up to the Deepwater Enterprise rig on the surface…

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