Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)

Associated Press
Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)
Frank Rojas, an employee of Bolls Heating and Cooling, clean and checks a gas furnace Tuesday, Nov. 13, 2012, in Indianapolis. An Indianapolis explosion that killed two people and decimated a neighborhood shows some signs that aren't typical of a natural gas explosion cause by an appliance but still could have been tied to a faulty furnace if conditions were right, experts said Tuesday. (AP Photo/Darron Cummings)
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