The grainy, black-and-white photos were captured from a video camera on a nearby Target store in Tinley Park.
The photos show a small, dark-colored sport utility vehicle in front of the store about the time of the shootings on February 2.
Police caution that they don't know whether the vehicle was involved in the crime, but they would like to track down the owner.
A gunman tried to rob the store before opening fire and shooting six women, one of whom survived.
