Chicago police released surveillance video, with some images blurred.
Investigators said the robbers approach people on foot, display a gun then make off with wallets, purses and phones.
Nearly all of these crimes took place during daytime hours in late October:
-7800 Block of South Marquette on October 20 at 3:00 p.m.
-7800 Block of South Phillips on October 29 at 11:50 a.m.
-7800 Block of South Essex on October 29 at 8:38 p.m.
-7800 Block of South Phillips on October 31 at 10:50 a.m.
-7800 Block of South Phillips on October 31 at 3:57 p.m.
Anyone with information, is asked to contact police at 312-747-8273.
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