obama administration announce thursday safety regulations offshore oil natural gas drill prevent kind explosion happen six years ago bp rig gulf mexico official tell reuters department interior unveil final version well control regulations require stringent design operate procedures well control equipment use offshore oil gas operations say official close rulemaking process agency first release proposal last april coincide fifth anniversary deadly deepwater horizon blowout oil spill gulf mexico 2010. macondo well blowout fire deepwater horizon drill rig april 20 2010 kill 11 workers bp agree october pay 20 billion fin resolve nearly claim oil spill mark large corporate settlement kind u.s. history last year interior secretary sally jewell say rule would build industry standards blowout preventers reform well design well control case cement real-time well monitor obama issue new offshore drill rule thursday source