Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012, by digging into the front sidewalk looking for possible explanation into the explosion of a house in Indianapolis. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger)

Photo by: Matt Kryger

Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012, by digging into the front sidewalk looking for possible explanation into the explosion of a house in Indianapolis. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger)