Article Photos: Indiana blast investigation focuses on natural gas 21/24

  Utility workers, and investigators stand in the rubble of a destroyed home on Fieldfare Way in the Richmond Hills subdivision Monday, Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night November 10, 2012. (AP Photo/The Indianapolis Star, Joe Vitti)