Memphis, Tennessee police say a car exploded when a woman lighting a cigarette ignited fumes from cleaning products.
The blast was reported about noon Thursday in an office building parking lot.
The driver suffered first-and second-degree burns on her face, arms and neck.
Memphis Police Director Larry Godwin said the driver, who is a cleaning woman, was sitting in the car when she lit a cigarette and caused "a vapor-type flash."
Witnesses said the explosion caused a "loud boom" that blew out all of the vehicle's windows.
It was the second time in a month that officials have investigated a car blast in the Memphis area. A Feb. 4 car bomb in West Memphis, Ark., nearly killed the head of the Arkansas State Medical Board.