Article Photos: Feds: Ruptured W.Va. pipe may have been corroded 1/4

This image provided by the West Virginia State Police shows a fireball erupting across Interstate 77 from a gas line explosion in Sissonville, W. Va.,Tuesday Dec. 11, 2012. At least five homes went up in flames Tuesday afternoon and a badly damaged section of Interstate 77 was shut down in both directions near Sissonville after a natural gas explosion triggered an hour-long inferno that officials say spanned about a quarter-mile.  (AP Photo/West Virginia State Police)