Engine Knocking Noise problems of the 2007 Lexus Gs450h

Tl-the contact owns a 2007 Lexus Gs450h. The contact stated that while driving at 10 mph, the contact heard a loud banging noise from underneath the engine. The contact came to a stop on the shoulder of the road and exited the vehicle. The vehicle caught fire. The vehicle was inspected by the insurance company but the cause of failure was undetermined. There was a report available from the fire marshall. The manufacturer was made aware of the failure, but no further assistance was provided. The failure and current mileage was 46,080. Yn.