VEHICLE WAS IN PARK WITH THE ENGINE NOT RUNNING. CAME OUT OF BIG DEAL CONVENIENT STORE LOCATED ON RTE 9 CHESTERFIELD, NH TO FIND SMOKE COMING OUT OF THE ENGINE COMPARTMENT. CALLED 911 AND USED A STORE FIRE EXTINGUISHER TO TRY TO PUT OUT THE FLAMES. WAITED FOR THE FIRE DEPT TO ARRIVE, THEY PUT THE ENGINE COMPARTMENT FIRE OUT.