WHILE DRIVING APPROXIMATELY 65 MPH ON HWY, HYBRID SYSTEM FAILURE ALERT TURNED ON. NO OTHER INDICATORS ON. ENGINE TEMP WAS NORMAL. ATTEMPTED TO PULL OVER AFTER A FEW MILES AND CAR SEIZED UP, SMOKE WAS BILLOWING FROM ENGINE COMPARTMENT. SMALL FLAMES VISIBLE THROUGH GRILL AND WITHIN MINUTES ENTIRE ENGINE COMPARTMENT ENGULFED IN FLAMES. NO PRIOR PROBLEMS EXCEPT THAT ABOUT 6 WEEKS EARLIER THE CHECK ENGINE LIGHT ILLUMINATED. I TOOK TO THE DEALER AND AFTER RUNNING COMPLETE ENGINE DIAGNOSTIC, DEALER ATTRIBUTED PROBLEM TO A LOOSE GAS CAP. AFTER THAT INCIDENT, THE CHECK ENGINE LIGHT HAD NOT REAPPEARED. I HAD THE ENGINE OIL CHANGED AT THE DEALER 4 DAYS PRIOR TO INCIDENT. CAR HAD APPROXIMATELY 28,000 MILES. *TR