The first incident occurred at about 3:25 a.m. in the 4400-block of North Pulaski Road.
Police said a male suspect entered a business, took out a gun and demanded money. The suspect then took a cash register before fleeing on foot.
At about 3:32 a.m. in the 2300-block of North Ashland Avenue, police said four suspects entered a business through a drive-thru window.
Once they got inside, police said they removed cash registers and then fled in a black sedan.
At about 4:20 a.m. in the 1600-block of South Blue Island Avenue, police said three male suspects entered through a drive-thru window.
The suspects then took out guns and removed a cash register before fleeing in a black sedan, police said.
No injuries were reported in any of the incidents.
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