"The TBI said on Tuesday or Wednesday the ATF (Bureau of Alcohol, Tobacco Firearms and Explosives) will be coming in to sift through the ashes" at the Kingdom Road home in which the children lived with their grandparents, Sheriff Randall Boyce said Monday.
Leon "Bubba" McClaran and his wife, Molly McClaran, died in the Sept. 23 blaze. Their remains have been recovered and released to the family.
The ATF investigates violent crimes, including fires with a potential of being considered suspicious.
Several unspecified "leads" have been pursued by the TBI, officials said, but one hit closer to home Sunday afternoon.
A caller to Bedford County 911 reported two children she thought fit the description of Chloie Leverette, 9, and Gage Daniel, 7, at a Union Street convenience store.
The caller gave a description of the vehicle they were seen in and Shelbyville police pulled it over on Parker Road off Rabbit Branch Road.
Three police officers stayed with the vehicle as the girl played in a nearby yard until a Bedford County deputy carrying photos of the children on his cell phone could arrive. The deputy quickly determined the children were not Chloie or Gage, Boyce said.
"The children in the car were with their mom and dad," Boyce said. "They looked nothing like those kids."
Boyce said his department has not received any similar calls.