Article Photos: Feds to probe why alarms failed in W.Va. explosion



  Flames from a gas line explosion cross Interstate 77 near Sissonville, W.Va., Tuesday, Dec. 11, 2012. West Virginia State Police say several structures are on fire and about a mile of Interstate 77 is shut down in both directions. (AP Photo/Joe Long) MAGS OUT

Flames from a gas line explosion cross Interstate 77 near Sissonville, W.Va., Tuesday, Dec. 11, 2012. West Virginia State Police say several structures are on fire and about a mile of Interstate 77 is shut down in both directions. (AP Photo/Joe Long) MAGS OUT