When exiting a car wash in the 900-block of Civic Center Drive in Niles, the driver accelerated over a curb, hitting three vehicles before continuing down a parking aisle and hitting another vehicle and the propane tanks, police said.
The propane tanks were not damaged, police said.
The Home Depot was evacuated as a precaution, Niles police said.
The elderly driver and another driver involved in the incident were taken to a hospital, with non-life threatening injuries.
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A building inspector determined the building was not damaged.
Two vehicles were towed, police said.
Chopper 7 was over the scene about 5 p.m., and at least two damaged vehicles could be seen outside the Home Depot.
Police did not immediately provide any additional information about the driver involved.