A New Orleans judge ruled on Thursday that British energy giant BP’s gross negligence led to the largest offshore oil spill in American history.
U.S. District Judge Carl Barbier said BP was mostly to blame for the 2010 Gulf of Mexico disaster, which killed 11 people and spewed oil into the water for 87 days.
Barbier attributed 67% of the fault to BP, 30% to Transocean, which owned the Deepwater Horizon drilling rig, and 3% to Halliburton, the cement contractor.
“BP’s conduct was reckless,” Barbier wrote in the decision, according to Bloomberg. “Transocean’s conduct was negligent. Halliburton’s conduct was negligent.”
Barbier oversaw a trial last year to distribute fault for the spill. BP could face up to $18 billion in fines, Bloomberg reports, though appeals will likely delay if and when any penalties are settled. The company pleaded guilty in 2012 to 14 federal counts and agreed to pay $4 billion to end the criminal case.
BP said in a statement it would appeal the decision. Its shares were down nearly 6% at 12:12 p.m. ET on Thursday.