Ohio building explosion caused by crew cutting gas line they thought was off, NTSB says

YOUNGSTOWN, Ohio — A crew working in the basement area of an Ohio building intentionally cut a gas line not knowing it was pressurized before a deadly explosion this week, the National Transportation Safety Board said Friday.

NTSB board member Tom Chapman said workers were in the basement to clear out piping and other outdated infrastructure. He said workers smelled no gas before they started cutting the pipe and knew there was a problem when they made the third cut.