An employee of a subcontractor laying fiber optic cable hit a 2-inch gas line with an underground boring machine about an hour before an explosion killed one person at a popular restaurant in Kansas City, Missouri. Fire Chief Paul Berardi told reporters the subcontractor, Heartland Midwest, called 911 at 4:55 p.m. CT to report the accident. Authorities do not know what caused the leaking gas to ignite, according to Rob Hack, chief operating officer of Missouri Gas Energy.