A prominent Birmingham law firm that Alabama Attorney General Troy King had tapped to sue BP over the Gulf oil spill will not take part in the litigation because of a potential conflict.

A spokesman for King, Chris Bence, said Tuesday the law firm Balch Bingham would not represent the state in the lawsuit because the Mississippi offices of the firm previously represented Transocean Ltd., owner of the Deepwater Horizon oil rig. An April 20 explosion on the rig killed 11 workers and left millions of gallons of oil spewing into the Gulf Of Mexico.