Feds release investigative docs on Lincoln County pipeline blast The rupture of the 30-inch-width regional gas pipeline in August 2019 in Lincoln County killed a woman and sent five others to the hospital. The National Transportation Safety Board, which is investigating the blast, released hundreds of files related to the investigation this week. By: Associated Press and last updated 2021-03-15 18:18:21-04 LOUISVILLE, Ky. (AP) â Heat from a deadly gas pipeline explosion in Kentucky burned so hot it melted the siding on a home 1,100 feet away, according to a federal investigation. The rupture of the 30-inch-width regional gas pipeline in August 2019 in Lincoln County killed a woman and sent five others to the hospital. The National Transportation Safety Board, which is investigating the blast, released hundreds of files related to the investigation this week.