The Justice Department has sued BP and eight other defendants in U.S. district court in New Orleans over the three-month oil spill in the Gulf of Mexico, U.S. Attorney General Eric Holder, Jr., announced on Wednesday.

The explosion on April 20 that eventually sank the Deepwater Horizon offshore drilling rig turned into the largest oil spill in U.S. history. BP, which leased the Deepwater Horizon for work on an undersea well, subsequently established a $20 billion compensation fund for victims of the spill.