FILE – In this image Dec. 11, 2012 file photo, provided by the West Virginia State Police, shows a fireball erupting across Interstate 77 from a gas line explosion in Sissonville, W.Va. Accident investigators issue a report and safety recommendations based three powerful gas transmission line explosions in California, Florida and West Virginia. In each case, the gas company failed conduct inspections or tests that might have revealed weaknesses in the massive pipelines. In the California accident, 9 people were killed and 70 homes destroyed. In the West Virginia incident, the stretch of pipeline that ruptured, igniting a fire that destroyed three homes and damaged several others, hadnt been inspected or tested for 24 years. (AP Photo/West Virginia State Police)