CHICAGO (WLS) -- the same group of men are behind the crimes.
Some of Monday's robberies happened just minutes apart. Chicago police said there have been at least 20 incidents since the beginning of April, mostly on the South and West sides.
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Monday's armed robberies took placed mainly in the area of Garfield Park, the Near West Side and North Lawndale at the following places and times:
Police said the group of men range from 16 to 21 years old, and wear black ski masks and black clothing. Police said they are armed with a gun. Police believe the vehicle they're using for the crimes is an older model black Chrysler 300 with tinted windows and a broken rear passenger window.
If you have information about these incidents, contact Area Four detectives at 312-746-8253.