Engine Clicking And Tapping Noises problems of the 2011 Lexus RX350

Parked in driveway in back of house, beside deck after short trip to store. Smelled a melting smell outside. Maybe five minutes later the smell started coming inside the house. We looked outside and saw smoke and thought the house was on fire. We went outside and there was smoke and flames coming from under the hood. Sprayed car with fire extinguisher, which did nothing, then used water hose to spray front of car to keep from the house catching on fire. Car was making popping noises, large amounts of smoke and strong smell. All neighbors came over it was strong. Fire department spent over an hour putting out fire and used their whole tank of water. Front end melted, tires popped, dashboard and windshield destroyed. Cause is unknown.