A photograph yesterday posted by the Des Moines Register showed the pickup resting under a sign that said "Fresh Produce," with boxes and other debris behind it.
"At this time, we don't have any reason to believe it was intentional," said Patrol Sgt. Nathan Ludwig, who was at the scene of the crash. Ludwig said officials are investigating all possible scenarios.
The crash in Pella, Iowa, just before 10 a.M. Killed three people, all outside the vehicle, and injured the driver and another person, Ludwig said. None of those killed or injured were children.
Wal-Mart management said in a statement: "We're heartbroken by what appears to be a tragic accident."
Pella a city of 10,000 known for its Dutch roots and fully functional 1850s-style windmill, is 38 miles southeast of Des Moines.
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