Agents have been checking out every lead that comes in, according to Kristin Helm, TBI spokesperson.
Autopsy reports for Mollie and Leon McClaran, just released this month, failed to determine how they died, according to the medical examiner’s office.
The autopsies also did not shed any more light on the fire that destroyed their Bedford County home.
The TBI said the fire damaged their remains so badly, the medical examiner could not determine a cause of death.
Authorities never found the bodies of the McClarans’ grandchildren, Leverette and Daniel.
The Amber Alert for the children remains active, according to the TBI. The fire occurred in September.