Utility workers, and investigators stand outside destroyed homes 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)
Utility workers, and investigators stand outside destroyed homes 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)
Monserrate Shirley, talks with a reporter and photographer about her home in Indianapolis, Tuesday, Nov. 13, 2012. Shirley's home was one of two of the main homes destroyed by an explosion of unknown origin on Saturday night. An owner of the house believed to be at the center of the explosion has said the home's furnace had been having problems, but his estranged wife, Monserrate Shirley, said the furnace was fine. (AP Photo/The Star, Robert Scheer)
Demolished vehicles sit in a destroyed attached garage at a home on Fieldfare Way in the Richmond Hills subdivision in Indianapolis, Monday Nov. 12, 2012. An explosion, originating on Fieldfare Way, destroyed or damaged as many as 80 structures in the subdivision late Saturday night Nov. 10, 2012. Investigators working to determine the cause of a deadly explosion that rocked an Indianapolis subdivision are looking at gas meters and pipelines as possible culprits, but a homeowners? suggestion that his faulty furnace could be to blame is drawing skepticism from at least one expert. (AP Photo/The Indianapolis Star, Joe Vitti)
Citizens Energy workers continue their investigation Monday afternoon Nov. 12, 2012 by digging into the front sidewalk looking for possible explanation into the explosion in Indianapolis. They are checking gas line, but caution it is too soon to rule other possible causes, (AP Photo/ WTHR Chopper 13 /The Indianapolis Star, Matt Kryger) NO SALES
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. 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) NO SALES
INDIANAPOLIS (AP) ? Investigators looking for the cause of a deadly Indianapolis house explosion got more support for their theory that natural gas was a factor Wednesday when an attorney for the owner of a home at the core of the blast said his client's 12-year-old daughter had smelled a strange odor off and on for weeks.
Still, finding the actual cause could take time as investigators search through homes that have been battered or obliterated for any clues about faulty appliances and gas leaks. It's possible they may never be able to pinpoint the cause.
"Extensive gas explosions are not easy to put back together," forensics consultant Jay A.Siegel said. "Finding the pieces and putting them back together is a giant puzzle."
Randall Cable, an attorney for homeowner Monserrate Shirley, said Wednesday that the woman's daughter had complained of an odor outdoors and in the garage area for several weeks before Saturday's blast that leveled two homes and left dozens more uninhabitable. Two people were killed.
"Once they went inside, they didn't smell it," Cable said. The odor wasn't strong enough to concern the adults, so they didn't report it, he said.
Shirley's boyfriend, Mark Leonard, replaced the home's thermostat about two or three weeks ago after the couple discovered the furnace wasn't working.
Investigators haven't said from which house they think the explosion originated. They said late Tuesday that they are looking at gas appliances in the homes that were consumed at the epicenter of the fiery blast, which flattened the Shirley home and the house next door where two people died.
The National Transportation Safety Board and the utility that provides gas service to the neighborhood have said they found no leaks in the gas main or pipes leading into the homes.
Real estate records show the Shirley home had a gas furnace and water heater.
But determining whether either of those caused the explosion is likely to be a long process because of the massive amount of damage.
John J. Lentini, a fire investigation expert who wrote the book "Scientific Protocol for Fire Investigation," said investigators will have to trace gas lines, valves and appliances inside homes where little more than charred boards and debris remains.
"You have to check the gas lines, and they tend to be gone," Lentini said. "You're probably not going to have much more than the meter."
In a natural gas explosion, leaking fuel builds up in an enclosed space until something ignites it, experts said. What follows is intense heat and a rush of air that creates a vacuum before the hot air rushes back in.
That rush of roiling air causes damage such as crumpled garage doors and can throw fragments of debris far away, said Siegel, an explosives expert who has taught forensic science at Michigan State University and Indiana-Purdue-University-Indianapolis.
But metal will survive the heat, Siegel said. So if a stove, furnace or water heater was the source, investigators will have some clues.
"It seldom happens that there'll be no fragment left of a gas appliance if it explodes," Siegel said. "Most often you will find large pieces of the appliance somewhere around. It may not be at the point of origin. It may be somewhere else in the house, hurtled through the wall."
Even smaller pieces, such as pieces of metal valve stems, can survive and be examined, Lentini said. Investigators can then tell what position the valves were in when the explosion occurred, and whether they might be a cause.
But sometimes no certain cause can be found.
"There are lots of explosions and fires where you have no cause, or no determined cause. And sometimes gas explosions fall into this category where you just can't figure out what caused the explosion," Siegel said.
Cable said he was skeptical that faulty appliances could have caused such a large explosion and suggested that Citizens Gas was trying to deflect blame. He said suspicion was being directed at Shirley because she was out of town when the house exploded.
"I would expect Citizens Gas to say they're not finding anything wrong whether they did or didn't at this point," he added.
Citizens Energy spokeswoman Sarah Holsapple said the utility had tested its gas lines in conjunction with the National Transportation Safety Board and the Indiana Utility Regulatory Commission.
"We feel very comfortable with our test results and both state and federal agencies have signed off on them," she said.
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