A year ago today, the Deepwater Horizon drilling rig exploded, killing 11 men and causing the largest offshore oil spill in U.S. history. At BP we regret that the accident happened and the impact it has had on the environment of the Gulf Coast and people living there.

From the start, we committed to pay all legitimate claims and work to restore the damage caused by the oil spill. We pledged to cooperate fully with all investigations into the cause of the accident. Finally, we said we would work to embed the lessons learned...