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Three roommates answered a knock at the back door of their residence in the 7000 block of Argonne Boulevard about 9:30 p.m. Friday. Two men entered, showed a handgun and demanded cellphones and other property.

A police officer who was in the area apprehended two men identified as Xine Loudin and Chris Fillinich, 21. A police report said the roommates suffered “superficial injuries.”