[JURIST] The US Department of Justice (DOJ) [official website] filed suit [complaint text; press release] Wednesday against units of British Petroleum (BP) [corporate website] and several other companies over the April Deepwater Horizon oil spill [BBC backgrounder; JURIST news archive], which resulted in an estimated 4.9 million barrels of oil flowing into the Gulf of Mexico. The lawsuit, filed in the US District Court for the Eastern District of Louisiana [official website], seeks civil penalties under the Clean Water Act…