The United States and the state of Arkansas filed a joint enforcement action against ExxonMobil in federal district court in Little Rock, Ark. The complaint addresses ExxonMobil’s unlawful discharge of heavy crude oil from the Pegasus Pipeline that ruptured in Mayflower, Ark., on March 29. The complaint alleges six causes of action against the defendants. The United States, on behalf of the U.S. Environmental Protection Agency, seeks civil penalties and injunctive relief under the federal Clean Water Act for the oil spill. The state of Arkansas seeks civil penalties and also seeks a declaratory judgment on ExxonMobil’s liability for payment of removal costs and damages related to the spill pursuant to the federal Oil Pollution Act.