The fire spread to the other cars Sunday afternoon before it could be stopped.
KIMA-TV reports no one was hurt.
A witness says he saw a car smoking when the driver pulled into the parking lot. When the driver went into the store, the car caught fire and spread to other cars nearby.
"A lot of people were freaking out worried about their cars," said witness Jeremiah Mount. "Some people even ran into their cars to drive it away, to get away from it."