NEW ORLEANS (AP) — The owner of the oil rig that exploded in the Gulf of Mexico in 2010 says BP hampered efforts to stop the resulting gusher of oil by misleading government officials about how many barrels of oil were flowing each day from the damaged well on the Gulf floor.

The Transocean corporation’s assertions were filed Friday in federal court in New Orleans, where a civil began last week to determine percentages of blame and how much BP, Transocean and others will pay for the April 2010 catastrophe that killed 11 workers and sent millions of gallons of oil spewing into the Gulf for 87 days.