A Hazmat crew was later called to the scene about 10:30 p.m., according to emergency scanner traffic, but why was not immediately clear.
Springfield police taped off the area where the device was located in a shopping cart outside the store.
The device, which was wrapped in duct tape, appeared to be 1 foot long and 2 inches wide, said Sgt. Doug Pergram of Springfield Police Division.
Officials had shoppers move their vehicles from the Walmart parking lot about 10:15 p.m.
Crews from Springfield Fire Rescue Division were also on scene.
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