(WMC-TV) - The Bureau of Alcohol, Tobacco, Firearms and Explosives is assisting in the search for two missing Bedford County children.
ATF agents started sifting through the remains of the house Wednesday. Several teams are slowly going through piles of rubble.
The ATF said they added 11 to 12 additional personnel, who might be able to help decide whether there are any remains in the debris that have not been detected.
The Tennessee Bureau of Investigation issued an Amber Alert for the children a couple weeks ago after previously issuing an endangered child alert.
Crews have spent days sifting through ashes by hand at the burned home of the children's step-grandparents, Leon and Molly McClaran, who died in the fire.
The TBI said they're working on a lot of leads in the case, but that has not yielded any results.
All of the interviews they've conducted indicate the two missing children were actually in the house at the time of the fire.
But State Bomb and Arson investigators said that the children were not victims of the fire and their whereabouts remain unknown at this time.
Search crews found what they thought was a tooth but said it is not enough to close the case.
Officials also said they found at least 20 propane tanks in the basement of the house, which probably made the fire much worse. While they do not suspect arson, they said they may never know what started the fire in the first place.
The children were last seen about three hours before the night of the fire.
Crews have also used helicopters and searched the nearby woods to see if the children escaped the fire.
The sheriff's department brought in additional cadaver dogs to assist in the search, as well as forensic teams from Middle Tennessee State University and the University of Tennessee.
If you have any information concerning the current whereabouts of Chloie and Gage, please contact the TBI at 1-800-TBI-FIND.