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:
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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.