/tags/national-tranportation-safety-board national tranportation safety board en-US Copyright Mon, 17 Sep 2018 19:58:28 GMT /news/2018-09-17/columbia-gas-investigated-after-massachusetts-explosions The National Transportation Safety Board is investigating Columbia Gas of Ohio's parent company NiSource after gas-related explosions and fires in north… Mon, 17 Sep 2018 19:58:28 GMT /news/2018-09-17/columbia-gas-investigated-after-massachusetts-explosions Adora Namigadde