Black Elk Energy Offshore Operations of Houston, Texas and Grand Isle Shipyards of Grand Isle Louisiana were charged on Thursday with involuntary manslaughter in connection with the November 2012 oil rig explosion in the Gulf of Mexico that left three men dead, according to Associated Press.
The blast and ensuing fire, which occurred during welding work on the platform 72 miles off Grand Isle, killed three Filipino workmen and injured several others.
Black Elk, which owned the platform, and its contractor Grand Isle have been previously accused of failing to observe proper safety procedures in the incident.
A federal grand jury in New Orleans filed the charges, the Department of Justice said on Thursday.
Black Elk is also facing other lawsuits over the tragedy including wrongful death and violation of the Clean Water Act. It is in Chapter 11 bankruptcy proceedings and last week hired Blackhill Partners as its restructuring advisor.