CHICAGO (WLS) -- Chicago police issued a warning on Sunday about an armed thief targeting Northwest Side businesses.

In each incident, the suspect enters a store, points a handgun at the clerk and demands money from the register, police said. The suspect then flees the scene with the stolen money.

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The robberies happened in the North Park and Norwood Park neighborhoods at the following times and locations:

5100-block of North Kimball Ave. on Aug. 15 at 11:20 p.m.

3400-block of West Peterson Ave. on Aug. 17 at 10:28 p.m.

5100-block of North Kimball Ave. on Aug. 30 at 11:44 p.m.

6300-block of North Milwaukee Ave. on Aug. 30 at 11:53 p.m.

The suspect is described as a male of an unknown age who wears dark clothing and a facemask.

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