Lakeland, Florida -- The catastrophic fire that killed a 3-year-old boy and left his father in critical condition appears to have occurred due to a faulty box fan, according to the State Fire Marshal's Office.
Photos: Aerial photos of the house fire in Lakeland
Authorities say Brian Myers, 32, remains in critical condition at Orlando Regional Medical Center Thursday. His son, London, was found dead by firefighters inside the home at 3418 Sheretz Road.
An autopsy was conducted Thursday to determine the cause of London's death. The results will be revealed once the toxicology report comes back. The sheriff's office says London suffered from thermal burns over 90 percent of his body.
The rest of the family was able to get out of the home, that was 90-95 percent engulfed in flames when firefighters arrived, unharmed. They are currently staying next door with family.
See Also: How you can help the Freeman/Myers family