Investigators ruled the fire as accidental, according to KEZI 9 News. The FPV drone pilot and investigators don’t exactly know how the quadcopter started the fire, but they believed it was a unique situation.

Snapshot from Cameron Austin-Connolly’s Facebook.
Austin-Connolly also uploaded the full flight video on Facebook to warn people about the dangers of flying drones in areas prone to fire.

Even though the quadcopter was custom built, all drones can still potentially start a fire.
According to The Register Guard, Austin-Connolly said, “I want this to be a cautionary tale for people, both for people flying drones in the dry season and for people walking dogs without a leash.”