BP shares appear set for their worst one-day fall since 2010 after a judge ruled the oil company had been negligent in events leading up to the 2010 Gulf of Mexico oil spill.
The company's shares were down by 6% at the close of trading in London - making it the worst performer on the FTSE 100.
The ruling could add billions of dollars in fines to the more than £25 billion the company has already been charged for the disaster.
More top news
Very windy with gales
An Irish man has become an unwitting internet star after his Facebook profile picture was photoshopped dozens of times.
Stranded refugees and migrants clashed with police after young Moroccan man accidentally electrocuted himself