Citizens Energy workers continue their investigation Monday, Nov. 12, 2012, at the 

Citizens Energy workers continue their investigation Monday, Nov. 12, 2012, at the site of an explosion at a house in Indianapolis. The search for what caused a massive, deadly explosion that rocked an Indianapolis neighborhood turned to natural gas Monday, with officials checking gas lines and a homeowner saying a problem furnace could be to blame. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger)
Associated Press
Citizens Energy workers continue their investigation Monday, Nov. 12, 2012, at the site of an explosion at a house in Indianapolis. The search for what caused a massive, deadly explosion that rocked an Indianapolis neighborhood turned to natural gas Monday, with officials checking gas lines and a homeowner saying a problem furnace could be to blame. (AP Photo/WTHR Chopper 13/The Indianapolis Star, Matt Kryger)
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